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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Apr. 30, 2019	Jun. 03, 2019
Document Information [Abstract]
Entity Registrant Name	MongoDB, Inc.
Entity Central Index Key	0001441816
Current Fiscal Year End Date	--01-31
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Document Type	10-Q
Document Period End Date	Apr. 30, 2019
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Amendment Flag	false
Class A Common Stock
Entity Common Stock, Shares Outstanding		41,955,411
Class B Common Stock
Entity Common Stock, Shares Outstanding		13,373,252

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Apr. 30, 2019	Jan. 31, 2019
Current assets:
Cash and cash equivalents	$ 158,060	$ 147,831
Short-term investments	318,346	318,139
Accounts receivable, net of allowance for doubtful accounts of $1,770 and $1,539 as of April 30, 2019 and January 31, 2019, respectively	61,600	72,808
Deferred commissions	16,932	15,878
Prepaid expenses and other current assets	12,251	11,580
Total current assets	567,189	566,236
Property and equipment, net	60,309	73,664
Operating lease right-of-use assets	12,378	0
Goodwill	41,878	41,878
Acquired intangible assets, net	14,223	15,894
Deferred tax assets	1,753	1,193
Other assets	36,511	34,611
Total assets	734,241	733,476
Current liabilities:
Accounts payable	2,080	2,153
Accrued compensation and benefits	24,122	25,982
Operating lease liabilities (current)	3,575	0
Other accrued liabilities	20,138	14,169
Deferred revenue	128,252	122,333
Total current liabilities	178,167	164,637
Deferred rent, non-current	0	2,567
Deferred tax liability, non-current	109	106
Operating lease liabilities, non-current	9,827	0
Deferred revenue, non-current	15,443	15,343
Convertible senior notes, net	220,079	216,858
Other liabilities, non-current	62,748	69,399
Total liabilities	486,373	468,910
Commitments and contingencies (Note 6)
Stockholders’ equity:
Additional paid-in capital	775,185	754,612
Treasury stock, 99,371 shares (repurchased at an average of $13.27 per share) as of April 30, 2019 and January 31, 2019	(1,319)	(1,319)
Accumulated other comprehensive loss	(103)	(174)
Accumulated deficit	(525,950)	(488,607)
Total stockholders’ equity	247,868	264,566
Total liabilities and stockholders’ equity	734,241	733,476
Class A Common Stock
Stockholders’ equity:
Common stock	42	36
Class B Common Stock
Stockholders’ equity:
Common stock	$ 13	$ 18

CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Apr. 30, 2019	Jan. 31, 2019
Current assets:
Allowance for doubtful accounts	$ 1,770	$ 1,539
Stockholders’ equity:
Treasury stock (in shares)	99,371	99,371
Average repurchase price of treasury stock shares (in dollars per share)	$ 13.27	$ 13.27
Class A Common Stock
Stockholders’ equity:
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock authorized (in shares)	1,000,000,000	1,000,000,000
Common stock issued (in shares)	41,843,367	36,286,573
Common stock outstanding (in shares)	41,843,367	36,286,573
Class B Common Stock
Stockholders’ equity:
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock authorized (in shares)	100,000,000	100,000,000
Common stock issued (in shares)	13,532,080	18,134,608
Common stock outstanding (in shares)	13,432,709	18,035,237

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Revenue:
Total revenue	$ 89,388	$ 50,139
Cost of revenue:
Total cost of revenue	28,172	13,749
Gross profit	61,216	36,390
Operating expenses:
Sales and marketing	46,120	33,197
Research and development	30,868	18,645
General and administrative	14,805	11,227
Total operating expenses	91,793	63,069
Loss from operations	(30,577)	(26,679)
Other income (expense):
Interest income	2,303	959
Interest expense	(4,689)	0
Other expense, net	(415)	(368)
Loss before provision for income taxes	(33,378)	(26,088)
Provision (benefit) for income taxes	(138)	467
Net loss	$ (33,240)	$ (26,555)
Net loss per share, basic and diluted (in dollars per share)	$ (0.61)	$ (0.53)
Weighted-average shares used to compute net loss per share, basic and diluted (in shares)	54,710,746	50,350,052
Subscription
Revenue:
Total revenue	$ 83,994	$ 46,069
Cost of revenue:
Total cost of revenue	22,595	10,070
Services
Revenue:
Total revenue	5,394	4,070
Cost of revenue:
Total cost of revenue	$ 5,577	$ 3,679

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Statement of Comprehensive Income [Abstract]
Net loss	$ (33,240)	$ (26,555)
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on available-for-sale securities	58	(82)
Foreign currency translation adjustments	13	(33)
Other comprehensive income (loss)	71	(115)
Total comprehensive loss	$ (33,169)	$ (26,670)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Class A and Class B Common Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Other Comprehensive Loss	Accumulated Deficit
Beginning balance (in shares) at Jan. 31, 2018		50,575,571
Beginning balance at Jan. 31, 2018	$ 247,657	$ 51	$ 638,680	$ (1,319)	$ (159)	$ (389,596)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises (in shares)		40,723
Stock option exercises	252		252
Repurchase of early exercised options (in shares)		(19,395)
Vesting of early exercised stock options	533		533
Vesting of restricted stock units (in shares)		125
Stock-based compensation	7,508		7,508
Unrealized loss on available-for-sale securities	(82)				(82)
Foreign currency translation adjustment	(33)				(33)
Net loss	(26,555)					(26,555)
Ending balance (in shares) at Apr. 30, 2018		50,597,024
Ending balance at Apr. 30, 2018	229,280	$ 51	646,973	(1,319)	(274)	(416,151)
Beginning balance (in shares) at Jan. 31, 2019		54,321,810
Beginning balance at Jan. 31, 2019	$ 264,566	$ 54	754,612	(1,319)	(174)	(488,607)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises (in shares)	831,901	831,901
Stock option exercises	$ 6,438	$ 1	6,437
Repurchase of early exercised options (in shares)		(3,981)
Vesting of early exercised stock options	127		127
Vesting of restricted stock units (in shares)		126,346
Stock-based compensation	14,009		14,009
Unrealized loss on available-for-sale securities	58				58
Foreign currency translation adjustment	13				13
Net loss	(33,240)					(33,240)
Ending balance (in shares) at Apr. 30, 2019		55,276,076
Ending balance at Apr. 30, 2019	$ 247,868	$ 55	$ 775,185	$ (1,319)	$ (103)	$ (525,950)

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Cash flows from operating activities
Net loss	$ (33,240)	$ (26,555)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	2,323	817
Stock-based compensation	14,009	7,508
Amortization of debt discount and issuance costs	3,221	0
Amortization of finance right-of-use assets	994	0
Non-cash interest on finance lease liabilities	905	0
Deferred income taxes	(557)	4
Accretion of discount on short-term investments	(1,509)	(381)
Change in operating assets and liabilities:
Accounts receivable	10,960	14,018
Prepaid expenses and other current assets	(260)	(2,865)
Deferred commissions	(2,987)	(1,268)
Other long-term assets	32	(70)
Accounts payable	(268)	(639)
Deferred rent	0	472
Accrued liabilities	3,324	(1,967)
Deferred revenue	6,267	2,877
Net cash provided by (used in) operating activities	3,214	(8,049)
Cash flows from investing activities
Purchases of property and equipment	(389)	(367)
Proceeds from maturities of marketable securities	140,000	58,000
Purchases of marketable securities	(139,024)	0
Net cash provided by investing activities	587	57,633
Cash flows from financing activities
Proceeds from exercise of stock options, including early exercised stock options	6,437	288
Repurchase of early exercised stock options	(30)	(152)
Net cash provided by financing activities	6,407	136
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	19	(8)
Net increase in cash, cash equivalents and restricted cash	10,227	49,712
Cash, cash equivalents and restricted cash, beginning of period	148,347	62,427
Cash, cash equivalents and restricted cash, end of period	158,574	112,139
Cash paid during the period for:
Income taxes, net of refunds	735	118
Noncash investing and financing activities
Vesting of early exercised stock options	127	533
Purchases of property and equipment included in accounts payable and accrued liabilities	283	51
Construction in progress related to build-to-suit lease obligations	$ 0	$ 4,225

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - Reconciliation - USD ($) $ in Thousands	Apr. 30, 2019	Apr. 30, 2018
Reconciliation of cash, cash equivalents, and restricted cash within the condensed consolidated balance sheets, end of period, to the amounts shown in the statements of cash flows above:
Cash and cash equivalents	$ 158,060	$ 111,617
Restricted cash, non-current	514	522
Total cash, cash equivalents and restricted cash	$ 158,574	$ 112,139

Organization and Description of Business	3 Months Ended
Organization and Description of Business	Apr. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Description of Business	Organization and Description of Business MongoDB, Inc. (“MongoDB” or the “Company”) was originally incorporated in the state of Delaware in November 2007 under the name 10Gen, Inc. In August 2013, the Company changed its name to MongoDB, Inc. The Company is headquartered in New York City. MongoDB is the leading, modern, general purpose database platform. The Company’s robust platform enables developers to build and modernize applications rapidly and cost-effectively across a broad range of use cases. Organizations can deploy the Company’s platform at scale in the cloud, on-premise, or in a hybrid environment. In addition to selling its software, the Company provides post-contract support, training, and consulting services for its offerings. The Company’s fiscal year ends January 31.

Summary of Significant Accounting Policies	3 Months Ended
Summary of Significant Accounting Policies	Apr. 30, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation The accompanying interim condensed consolidated balance sheet as of April 30, 2019, the interim condensed consolidated statements of stockholders’ equity for the three months ended April 30, 2019 and 2018, the interim condensed consolidated statements of operations and of comprehensive loss for the three months ended April 30, 2019 and 2018 and the interim condensed consolidated statements of cash flows for the three months ended April 30, 2019 and 2018 are unaudited. The interim unaudited condensed consolidated financial statements have been prepared on a basis consistent with the annual consolidated financial statements and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments, necessary to state fairly the Company’s financial position as of April 30, 2019, its statements of stockholders’ equity as of April 30, 2019 and 2018, its results of operations and of comprehensive loss for the three months ended April 30, 2019 and 2018, and its statements of cash flows for the three months ended April 30, 2019 and 2018. The financial data and the other financial information disclosed in the notes to these interim condensed consolidated financial statements related to the three-month periods are also unaudited. The results of operations for the three months ended April 30, 2019 are not necessarily indicative of the results to be expected for the fiscal year ending January 31, 2020 or for any other future year or interim period. The interim unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and include the accounts of the Company and its wholly owned subsidiaries. All intercompany transactions and accounts have been eliminated. Certain information and note disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to the applicable rules and regulations of the Securities and Exchange Commission (“SEC”). The condensed balance sheet data as of January 31, 2019 was derived from the Company’s audited financial statements, but does not include all disclosures required by U.S. GAAP. Therefore, these interim unaudited condensed consolidated financial statements and accompanying footnotes should be read in conjunction with the Company’s annual consolidated financial statements and related footnotes included in its Annual Report on Form 10-K for the fiscal year ended January 31, 2019 (the “2019 Form 10-K”). Effective February 1, 2018, the Company adopted Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers (Topic 606). All amounts and disclosures in this Quarterly Report on Form 10-Q have been updated to comply with the new revenue standard. Use of Estimates The preparation of the interim unaudited condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting period. Such estimates include, but are not limited to, revenue recognition, allowances for doubtful accounts, stock-based compensation, legal contingencies, fair value of acquired intangible assets and goodwill, useful lives of acquired intangible assets and property and equipment, fair value of property and equipment and accounting for income taxes. The Company bases these estimates on historical and anticipated results, trends and various other assumptions that it believes are reasonable under the circumstances, including assumptions as to future events. Actual results could differ from those estimates. Significant Accounting Policies There have been no changes to the Company’s significant accounting policies described in the Company’s 2019 Form 10-K other than the adoption of the new accounting guidance related to leases and stock-based compensation, effective February 1, 2019, as discussed in “Recently Adopted Accounting Pronouncements” below. Further disclosures with respect to the Company’s leases are also included in Note 5, Leases. Related Party Transactions All contracts with related parties are executed in ordinary course of business. There were no material related party transactions in the three months ended April 30, 2019 and 2018. As of April 30, 2019 and January 31, 2019, there were no material amounts payable to or amounts receivable from related parties. Recently Adopted Accounting Pronouncements Leases. In February 2016, the Financial Accounting Standards Board issued Accounting Standards Update (“ASU”) 2016-02, codified as Accounting Standards Codification 842 (“ASC 842”), which requires lessees to record the assets and liabilities arising from all leases, with the exception of short-term leases, on the balance sheet. Under ASC 842, lessees will recognize a liability for lease payments and a right-of-use asset. This guidance retains the distinction between finance leases and operating leases and the classification criteria for finance leases remains similar. For finance leases, a lessee will recognize the interest on a lease liability separate from amortization of the right-of-use asset. In addition, repayments of principal will be presented within financing activities, and interest payments will be presented within operating activities in the statement of cash flows. For operating leases, a lessee will recognize a single lease cost on a straight-line basis and classify all cash payments within operating activities in the statement of cash flows. The Company adopted the new lease accounting standard effective February 1, 2019 using the additional transition method described in ASU No. 2018-11, Leases – Targeted Improvements, which was issued in July 2018. Under the additional transition method, the Company recognized the cumulative effect of initially applying the guidance as an adjustment to the operating lease right-of-use assets and operating lease liabilities on its condensed consolidated balance sheet on February 1, 2019 without retrospective application to comparative periods. The adoption of ASC 842 resulted in recognition of right-of-use assets of $53.7 million, which included the impact of existing deferred rents of $2.9 million and lease liabilities of $70.2 million, along with a cumulative impact of $4.1 million on the opening accumulated deficit, as of February 1, 2019. The Company elected the package of practical expedients permitted under the transition guidance within ASC 842, which allowed the Company to carry forward its historical assessments of whether contracts are or contain leases, lease classification and initial direct costs. See Note 5, Leases, for additional details. The Company determines if an arrangement is, or contains, a lease at inception. Operating leases are disclosed separately on the consolidated balance sheets and the finance lease is included in property and equipment, net, other accrued liabilities and other liabilities, non-current. The Company has elected an accounting policy to not recognize short-term leases (one year or less) on the consolidated balance sheet. Operating lease right of use assets and operating lease liabilities are recognized based on the present value of the lease payments over the lease term at commencement date. As all of the Company’s leases do not provide an implicit rate, the Company’s incremental borrowing rate is used based on the information available at commencement date in determining the present value of future payments. The operating lease right of use asset also includes any lease payments made and excludes lease incentives. Lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term. The Company accounts for lease components and non-lease components as a single lease component. Stock-Based Compensation. In June 2018, the FASB issued ASU No. 2018-07, Compensation - Stock Compensation (Topic 718): Improvements to Non-employee Share-Based Payment Accounting, which expands the scope of Topic 718 to include share-based payment transactions for acquiring goods and services from non-employees, with certain exceptions. The new guidance was effective for the Company for fiscal year beginning February 1, 2019 and the adoption had no material impact on its consolidated financial statements. New Accounting Pronouncements Not Yet Adopted Goodwill Impairment. In January 2017, the FASB issued ASU 2017-04—Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The new standard simplifies the measurement of goodwill by eliminating step two of the two-step impairment test. Step two measures a goodwill impairment loss by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of that goodwill. The new guidance requires an entity to compare the fair value of a reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value. Additionally, an entity should consider income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. The new guidance becomes effective for the Company for the fiscal year beginning February 1, 2020, though early adoption is permitted. The Company does not expect the adoption of the new accounting standard to have a material impact on its consolidated financial statements. Cloud Computing. In August 2018, the FASB issued ASU 2018-15, Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract, which aligns the accounting for implementation costs incurred in a hosting arrangement that is a service contract with the accounting for implementation costs incurred to develop or obtain internal-use software under ASC 350-40, in order to determine which costs to capitalize and recognize as an asset and which costs to expense. ASU 2018-15 becomes effective for the Company for the fiscal year beginning February 1, 2020, with early adoption permitted, and can be applied either prospectively to implementation costs incurred after the date of adoption or retrospectively to all arrangements. The Company is currently evaluating the impact of the adoption of this standard on its consolidated financial statements. Credit Losses. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which requires the measurement and recognition of expected credit losses for financial assets held at amortized cost, which includes the Company's accounts receivables, certain financial instruments and contract assets. ASU 2016-13 replaces the existing incurred loss impairment model with an expected loss methodology, which will result in more timely recognition of credit losses. For available-for-sale debt securities, credit losses should be recorded through an allowance for credit losses. ASU 2016-13 becomes effective for the Company for the fiscal year beginning February 1, 2020 and requires a cumulative effect adjustment to the balance sheet as of the beginning of the first reporting period in which the guidance is effective. The Company is evaluating the impact of the adoption of ASU 2016-13 on its consolidated financial statements.

Fair Value Measurements

3 Months Ended

Apr. 30, 2019

Fair Value Disclosures [Abstract]

Fair Value Measurements

The following tables present information about the Company’s financial assets that have been measured at fair value on a recurring basis as of April 30, 2019 and January 31, 2019, and indicate the fair value hierarchy of the valuation inputs utilized to determine such fair value (in thousands):



	Fair Value Measurement at April 30, 2019
	Level 1		Level 2		Level 3		Total
Financial Assets:
Cash and cash equivalents:
Money market funds	$	50,356	$	—	$	—	$	50,356
Short-term investments:
U.S. government treasury securities	318,346		—		—		318,346
Total financial assets	$	368,702	$	—	$	—	$	368,702



	Fair Value Measurement at January 31, 2019
	Level 1		Level 2		Level 3		Total
Financial Assets:
Cash and cash equivalents:
Money market funds	$	88,015	$	—	$	—	$	88,015
Short-term investments:
U.S. government treasury securities	318,139		—		—		318,139
Total financial assets	$	406,154	$	—	$	—	$	406,154

The Company utilized the market approach and Level 1 valuation inputs to value its money market mutual funds and U.S. government treasury securities because published net asset values were readily available. As of April 30, 2019 and January 31, 2019, gross unrealized gains and unrealized losses for cash equivalents and short-term investments were not material, and the contractual maturity of all marketable securities was less than one year.

In addition to its cash, cash equivalents and short-term investments, the Company measures the fair value of its outstanding Notes (as defined below) on a quarterly basis for disclosure purposes. The Company considers the fair value of the Notes at April 30, 2019 to be a Level 2 measurement due to limited trading activity of the Notes. Refer to Note 4, Convertible Senior Notes, to the condensed consolidated financial statements for further details.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Convertible Senior Notes

3 Months Ended

Apr. 30, 2019

Debt Disclosure [Abstract]

Convertible Senior Notes

In June 2018, the Company issued $250.0 million aggregate principal amount of 0.75% convertible senior notes due 2024 (the “Notes”) in a private placement and, in July 2018, the Company issued an additional $50.0 million aggregate principal amount of the Notes pursuant to the exercise in full of the initial purchasers’ option to purchase additional Notes. The Notes are senior unsecured obligations of MongoDB and interest is payable semiannually in arrears on June 15 and December 15 of each year, beginning on December 15, 2018, at a rate of 0.75% per year. The Notes will mature on June 15, 2024, unless earlier converted, redeemed or repurchased. The total net proceeds from the offering, after deducting initial purchase discounts and estimated debt issuance costs, were approximately $291.1 million.

The initial conversion rate is 14.6738 shares of MongoDB’s Class A common stock per $1,000 principal amount of Notes, which is equal to an initial conversion price of approximately $68.15 per share of Class A common stock, subject to adjustment upon the occurrence of specified events. The Notes will be convertible at the option of the holders at any time prior to the close of business on the business day immediately preceding March 15, 2024, only under the following circumstances:

(1)

during any fiscal quarter commencing after the fiscal quarter ending on October 31, 2018 (and only during such fiscal quarter), if the last reported sale price of the Company’s Class A common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding fiscal quarter is greater than or equal to 130% of the conversion price of the Notes on each applicable trading day;


(2)	during the five-business day period after any five consecutive trading day period (the “measurement period”) in which the trading price per $1,000 principal amount of the Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the Company’s Class A common stock and the conversion rate of the Notes on each such trading day;


(3)	if the Company calls any or all of the Notes for redemption, at any time prior to the close of business on the scheduled trading day immediately preceding the redemption date; or


(4)	upon the occurrence of specified corporate events (as set forth in the indenture governing the Notes).

On or after March 15, 2024, until the close of business on the scheduled trading day immediately preceding the maturity date, holders may convert all or any portion of their Notes, in multiples of $1,000 principal amount, at the option of the holder, regardless of the foregoing circumstances. Upon conversion, the Company will satisfy its conversion obligation by paying or delivering, as the case may be, cash, shares of the Company’s Class A common stock or a combination of cash and shares of the Company’s Class A common stock, at the Company’s election. If a fundamental change (as defined in the indenture governing the Notes) occurs prior to the maturity date, holders of the Notes will have the right to require the Company to repurchase for cash all or any portion of their Notes at a repurchase price equal to 100% of the principal amount of the Notes to be repurchased, plus accrued and unpaid interest to, but excluding, the fundamental change repurchase date. In addition, if specific corporate events occur prior to the applicable maturity date, or if the Company elects to redeem the Notes, the Company will increase the conversion rate for a holder who elects to convert their notes in connection with such a corporate event or redemption in certain circumstances. It is the Company’s current intent to settle the principal amount of the Notes in cash.

During the three months ended April 30, 2019, the conditional conversion feature of the Notes was triggered as the last reported sale price of the Company's Class A common stock was more than or equal to 130% of the conversion price for at least 20 trading days in the period of 30 consecutive trading days ending on April 30, 2019 (the last trading day of the fiscal quarter), and therefore the Notes are currently convertible, in whole or in part, at the option of the holders between May 1, 2019 through July 31, 2019. Whether the Notes will be convertible following such period will depend on the continued satisfaction of this condition or another conversion condition in the future. As of April 30, 2019, the Company had not received any conversion notices. Since the Company has the election of repaying the Notes in cash, shares of the Company’s Class A common stock, or a combination of both, the Company continued to classify the Notes as long-term debt on the Company’s condensed consolidated balance sheet as of April 30, 2019.

The Company may not redeem the Notes prior to June 20, 2021. On or after June 20, 2021, the Company may redeem for cash all or any portion of the Notes, at its option, if the last reported sale price of its Class A common stock was at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period (including the last trading day of such period) ending on, and including, the trading day immediately preceding the date on which the Company provides a notice of redemption at a redemption price equal to 100% of the principal amount of the Notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date.

In accounting for the issuance of the Notes, the Notes were separated into liability and equity components. The carrying amounts of the liability component was calculated by measuring the fair value of similar liabilities that do not have associated convertible features. The carrying amount of the equity component representing the conversion option was determined by deducting the fair value of the liability component from the par value of the respective Notes. This difference represents the debt discount that is amortized to interest expense over the respective terms of the Notes using the effective interest rate method. The carrying amount of the equity component representing the conversion option was $84.2 million. The equity component was recorded in additional paid-in capital and is not remeasured as long as it continues to meet the conditions for equity classification.

In accounting for the debt issuance costs of $8.8 million related to the Notes, the Company allocated the total amount incurred to the liability and equity components of the Notes based on their relative values. Issuance costs attributable to the liability component were $6.3 million and will be amortized, along with the debt discount, to interest expense over the contractual term of the Notes at an effective interest rate of 7.03%. Issuance costs attributable to the equity component were $2.5 million and are netted against the equity component representing the conversion option in additional paid-in capital.

The net carrying amount of the liability component of the Notes was as follows (in thousands):



	April 30, 2019
Principal	$	300,000
Unamortized debt discount	(74,178		)
Unamortized debt issuance costs	(5,743		)
Net carrying amount	$	220,079

The net carrying amount of the equity component of the Notes was as follows (in thousands):



	April 30, 2019
Debt discount for conversion option	$	84,168
Issuance costs	(2,485		)
Net carrying amount	$	81,683

As of April 30, 2019, the total estimated fair value of the Notes was approximately $630.8 million. The fair value was determined based on the closing trading price per $100 of the Notes as of the last day of trading for the period. The fair value of the Notes is primarily affected by the trading price of the Company’s common stock and market interest rates.

The following table sets forth the interest expense related to the Notes (in thousands):



	Three Months Ended April 30,
	2019		2018
Contractual interest expense	$	563	$	—
Amortization of debt discount	3,033		—
Amortization of issuance costs	188		—
Total	$	3,784	$	—

Capped Calls

In connection with the pricing of the Notes, the Company entered into privately negotiated capped call transactions with certain counterparties (“Capped Calls”). The Capped Calls each have an initial strike price of approximately $68.15 per share, subject to certain adjustments, which corresponds to the initial conversion price of the Notes. The Capped Calls have initial cap prices of $106.90 per share, subject to certain adjustments. The Capped Calls are expected to partially offset the potential dilution to the Company’s Class A common stock upon any conversion of the Notes, with such offset subject to a cap based on the cap price. The Capped Calls cover, subject to anti-dilution adjustments, approximately 4.4 million shares of the Company’s Class A common stock. The Capped Calls are subject to adjustment upon the occurrence of specified extraordinary events affecting the Company, including merger events, tender offers and the announcement of such events. In addition, the Capped Calls are subject to certain specified additional disruption events that may give rise to a termination of the Capped Calls, including nationalization, insolvency or delisting, changes in law, failures to deliver, insolvency filings and hedging disruptions. For accounting purposes, the Capped Calls are separate transactions, and not part of the terms of the Notes. As these transactions meet certain accounting criteria, the Capped Calls are recorded in stockholders' equity and are not accounted for as derivatives. The cost of $37.1 million incurred to purchase the Capped Calls was recorded as a reduction to additional paid-in capital and will not be remeasured.

Leases (Notes)

3 Months Ended

Apr. 30, 2019

Leases [Abstract]

Leases

Finance Lease

In December 2017, the Company entered into a lease agreement for 106,230 rentable square feet of office space (the “Premises”) to accommodate its growing employee base in New York City. The Company received delivery of the Premises on January 1, 2018 to commence construction to renovate the Premises. Total estimated aggregate base rent payments over the initial 12-year term of the lease are $87.3 million, with payments beginning 18 months after delivery of the Premises. The Company has the option to extend the term of the lease by an additional 5 years.

Operating Leases

The Company has entered into non-cancelable operating leases, primarily related to rental of office space expiring through 2029. The Company recognizes operating lease costs on a straight-line basis over the term of the agreement, taking into account adjustments for market provisions such as free or escalating base monthly rental payments or deferred payment terms such as rent holidays that defer the commencement date of the required payments. The Company may receive renewal or expansion options, leasehold improvement allowances or other incentives on certain lease agreements.

Lease Costs

The components of the Company’s lease costs included in its condensed consolidated statement of operations were as follows (in thousands):



	Three Months Ended April 30, 2019
Finance lease cost:
Amortization of right-of-use assets	$	994
Interest on lease liabilities	905
Operating lease cost	967
Short-term lease cost	395
Total lease cost	$	3,261

Balance Sheet Components

The balances of the Company’s operating and finance leases were recorded on the condensed consolidated balance sheet as follows (in thousands):



	April 30, 2019
Operating Leases:
Operating lease right-of-use assets	$	12,378
Operating lease liabilities (current)	3,575
Operating lease liabilities, non-current	9,827
Finance Lease:
Property and equipment, net	$	42,392
Other accrued liabilities	2,133
Other liabilities, non-current	62,755

Supplemental Information

The following table presents supplemental information related to the Company’s operating and finance leases during the three months ended April 30, 2019 (in thousands, except weighted-average information):



	Three Months Ended April 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from finance lease	$	—
Operating cash flows from operating leases	1,032
Financing cash flows from finance lease	—
Right-of-use assets obtained in exchange for lease obligations:
Finance lease	$	—
Operating leases	2,269
Weighted-average remaining lease term (in years):
Finance lease	10.7
Operating leases	4.8
Weighted-average discount rate:
Finance lease	5.6		%
Operating leases	6.1		%

Maturities of Lease Liabilities

Future minimum lease payments under non-cancelable finance and operating leases on an annual undiscounted cash flow basis as of April 30, 2019 were as follows (in thousands):



Year Ending January 31,	Finance Lease			Operating Leases
Remainder of 2020	$	3,732		$	4,017
2021	8,073			4,189
2022	8,073			2,579
2023	8,073			2,529
2024	8,073			1,014
Thereafter	51,274			2,103
Total minimum payments	87,298			16,431
Less imputed interest	(22,410		)	(3,029		)
Present value of future minimum lease payments	64,888			13,402
Less current obligations under leases	(2,133		)	(3,575		)
Non-current lease obligations	$	62,755		$	9,827

Future minimum lease payments under non-cancelable financing and operating leases, based on the previous lease accounting standard, as of January 31, 2019, were as follows (in thousands):



Year Ending January 31,	Financing Lease		Operating Leases
2020	$	3,732	$	4,578
2021	8,073		3,765
2022	8,073		2,277
2023	8,073		2,224
2024	8,073		922
Thereafter	51,274		2,149
Total minimum payments	$	87,298	$	15,915

Leases

Finance Lease

Operating Leases

Lease Costs

The components of the Company’s lease costs included in its condensed consolidated statement of operations were as follows (in thousands):



	Three Months Ended April 30, 2019
Finance lease cost:
Amortization of right-of-use assets	$	994
Interest on lease liabilities	905
Operating lease cost	967
Short-term lease cost	395
Total lease cost	$	3,261

Balance Sheet Components

The balances of the Company’s operating and finance leases were recorded on the condensed consolidated balance sheet as follows (in thousands):



	April 30, 2019
Operating Leases:
Operating lease right-of-use assets	$	12,378
Operating lease liabilities (current)	3,575
Operating lease liabilities, non-current	9,827
Finance Lease:
Property and equipment, net	$	42,392
Other accrued liabilities	2,133
Other liabilities, non-current	62,755

Supplemental Information



	Three Months Ended April 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from finance lease	$	—
Operating cash flows from operating leases	1,032
Financing cash flows from finance lease	—
Right-of-use assets obtained in exchange for lease obligations:
Finance lease	$	—
Operating leases	2,269
Weighted-average remaining lease term (in years):
Finance lease	10.7
Operating leases	4.8
Weighted-average discount rate:
Finance lease	5.6		%
Operating leases	6.1		%

Maturities of Lease Liabilities

Future minimum lease payments under non-cancelable finance and operating leases on an annual undiscounted cash flow basis as of April 30, 2019 were as follows (in thousands):



Year Ending January 31,	Finance Lease			Operating Leases
Remainder of 2020	$	3,732		$	4,017
2021	8,073			4,189
2022	8,073			2,579
2023	8,073			2,529
2024	8,073			1,014
Thereafter	51,274			2,103
Total minimum payments	87,298			16,431
Less imputed interest	(22,410		)	(3,029		)
Present value of future minimum lease payments	64,888			13,402
Less current obligations under leases	(2,133		)	(3,575		)
Non-current lease obligations	$	62,755		$	9,827

Future minimum lease payments under non-cancelable financing and operating leases, based on the previous lease accounting standard, as of January 31, 2019, were as follows (in thousands):



Year Ending January 31,	Financing Lease		Operating Leases
2020	$	3,732	$	4,578
2021	8,073		3,765
2022	8,073		2,277
2023	8,073		2,224
2024	8,073		922
Thereafter	51,274		2,149
Total minimum payments	$	87,298	$	15,915

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Apr. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Non-cancelable Material Commitments During the three months ended April 30, 2019, there have been no material changes outside the ordinary course of business to the Company’s contractual obligations and commitments from those disclosed in the 2019 Form 10-K. Legal Matters From time to time, the Company has become involved in claims and other legal matters arising in the ordinary course of business. For example, on March 12, 2019, Realtime Data filed a lawsuit against the Company in the United States District Court for the District of Delaware alleging that the Company is infringing three U.S. patents that it holds: U.S. Patent No. 9,116,908, U.S. Patent No. 9,667,751 and U.S. Patent No. 8,933,825. The patent infringement allegations in the lawsuit relate to data compression, decompression, storage and retrieval. Realtime seeks monetary damages and injunctive relief. The Company investigates these claims as they arise. Although claims are inherently unpredictable, the Company is currently not aware of any matters that, if determined adversely to the Company, would individually or taken together have a material adverse effect on its business, financial position, results of operations or cash flows. The Company accrues estimates for resolution of legal and other contingencies when losses are probable and estimable. From time to time, the Company is a party to litigation and subject to claims and threatened claims incident to the ordinary course of business, including intellectual property claims, labor and employment claims, breach of contract claims, and other matters. Although the results of litigation and claims are inherently unpredictable, the Company believes that there was not at least a reasonable possibility that the Company had incurred a material loss with respect to such loss contingencies, as of April 30, 2019 and January 31, 2019, therefore, the Company has not recorded an accrual for such contingencies. Indemnification The Company enters into indemnification provisions under its agreements with other companies in the ordinary course of business, including business partners, landlords, contractors and parties performing its research and development. Pursuant to these arrangements, the Company agrees to indemnify, hold harmless, and reimburse the indemnified party for certain losses suffered or incurred by the indemnified party as a result of the Company’s activities. The terms of these indemnification agreements are generally perpetual. The maximum potential amount of future payments the Company could be required to make under these agreements is not determinable. The Company has never incurred costs to defend lawsuits or settle claims related to these indemnification agreements. As a result, the Company believes the fair value of these agreements is not material. The Company maintains commercial general liability insurance and product liability insurance to offset certain of the Company’s potential liabilities under these indemnification provisions. The Company has entered into indemnification agreements with each of its directors and executive officers. These agreements require the Company to indemnify such individuals, to the fullest extent permitted by Delaware law, for certain liabilities to which they may become subject as a result of their affiliation with the Company.

Revenue

3 Months Ended

Apr. 30, 2019

Revenues [Abstract]

Revenue

Disaggregation of Revenue

Based on the information provided to and reviewed by the Company’s Chief Executive Officer, the Company believes that the nature, amount, timing, and uncertainty of its revenue and cash flows and how they are affected by economic factors is most appropriately depicted through the Company’s primary geographical markets and subscription product categories. The Company’s primary geographical markets are North and South America (“Americas”); Europe, Middle East and Africa (“EMEA”); and Asia Pacific. The Company also disaggregates its subscription products between its MongoDB Atlas-related offerings, which includes mLab, and other subscription products, which includes MongoDB Enterprise Advanced.

The following table presents the Company’s revenues disaggregated by primary geographical markets, subscription product categories and services (in thousands):



	Three Months Ended April 30,
	2019		2018
Primary geographical markets:
Americas	$	57,756	$	33,420
EMEA	25,320		14,024
Asia Pacific	6,312		2,695
Total	$	89,388	$	50,139

Subscription product categories and services:
MongoDB Atlas-related	$	30,863	$	6,963
Other subscription	53,131		39,106
Services	5,394		4,070
Total	$	89,388	$	50,139

Customers located in the United States accounted for 60% and 63% of total revenue for the three months ended April 30, 2019 and 2018, respectively. Customers located in the United Kingdom accounted for 10% and 9% of total revenue for the three months ended April 30, 2019 and 2018, respectively. No other country accounted for 10% or more of revenue for the periods presented.

As of April 30, 2019 and 2018, substantially all of the Company’s long-lived assets were located in the United States.

Contract Liabilities

The Company’s contract liabilities are recorded as deferred revenue in the Company’s consolidated balance sheet and consists of customer invoices issued or payments received in advance of revenues being recognized from the Company’s subscription and services contracts. Deferred revenue, including current and non-current balances, as of April 30, 2019 and January 31, 2019 was $143.7 million and $137.7 million, respectively. For the three months ended April 30, 2019 and 2018, revenue recognized from deferred revenue at the beginning of each period was $45.1 million and $30.3 million, respectively.

Remaining Performance Obligations

Remaining performance obligations represent the aggregate amount of the transaction price in contracts allocated to performance obligations not delivered, or partially undelivered, as of the end of the reporting period. Remaining performance obligations include unearned revenue, multi-year contracts with future installment payments and certain unfulfilled orders against accepted customer contracts at the end of any given period. As of April 30, 2019, the aggregate transaction price allocated to remaining performance obligations was $178.8 million. Approximately 53% is expected to be recognized as revenue over the next 12 months and the remainder thereafter. The Company applied the practical expedient to omit disclosure with respect to the amount of the transaction price allocated to remaining performance obligations if the related contract has a total duration of 12 months or less.

Unbilled Receivables

Revenue recognized in excess of invoiced amounts creates an unbilled receivable, which represents the Company’s unconditional right to consideration in exchange for goods or services that the Company has transferred to the customer. Unbilled receivables were recorded as part of accounts receivable, net in the Company’s consolidated balance sheets. As of April 30, 2019, unbilled receivables were $7.9 million.

Costs Capitalized to Obtain Contracts with Customers

The Company capitalizes the incremental costs that are directly associated with non-cancelable subscription contracts with customers and consist of sales commissions paid to the Company’s sales force, which were recorded as deferred commissions and other assets, depending on the expected length of the deferral, in the Company’s consolidated balance sheets.

Deferred commissions were $51.6 million as of April 30, 2019. Amortization expense with respect to deferred commissions was $4.4 million and $3.1 million for the three months ended April 30, 2019 and 2018, respectively. There was no impairment loss in relation to the costs capitalized for the periods presented.

Equity Incentive Plans and Employee Stock Purchase Plan

3 Months Ended

Apr. 30, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Equity Incentive Plans and Employee Stock Purchase Plan

Equity Incentive Plans

The Company adopted the 2008 Stock Incentive Plan (as amended, the “2008 Plan”) in 2008 and the 2016 Equity Incentive Plan (as amended, the “2016 Plan”) in 2016, primarily for the purpose of granting stock-based awards to employees, directors, and consultants. With the establishment of the 2016 Plan in December 2016, all shares available for grant under the 2008 Plan were transferred to the 2016 Plan. The Company no longer grants any stock-based awards under the 2008 Plan and any shares underlying stock options canceled under the 2008 Plan will be automatically transferred to the 2016 Plan.

Stock Options

The 2016 Plan provides for the issuance of incentive stock options to employees and nonstatutory stock options to employees, directors or consultants. The Board of Directors or a committee thereof determines the vesting schedule for all equity awards. Stock option awards generally vest over a period of four years with 25% vesting on the one-year anniversary of the award and the remainder vesting monthly over the next 36 months of the grantee’s service to the Company.

The following table summarizes stock option activity for the three months ended April 30, 2019 (in thousands, except share and per share data and years):



	Shares		Weighted- Average Exercise Price Per Share		Weighted- Average Remaining Contractual Term (In Years)	Aggregate Intrinsic Value
Balance - January 31, 2019	8,621,010		$	7.75	6.7	$	729,392
Stock options exercised	(831,901	)	7.71
Stock options forfeited and expired	(77,121	)	10.45
Balance - April 30, 2019	7,711,988		7.73		6.5	1,027,149
Vested and exercisable - January 31, 2019	5,342,183		6.95		6.0	456,275
Vested and exercisable - April 30, 2019	4,917,890		$	6.95	5.9	$	658,851

Restricted Stock Units

The 2016 Plan provides for the issuance of restricted stock units (“RSUs”) to employees, directors and consultants. RSUs granted to new employees generally vest over a period of four years with 25% vesting on the one-year anniversary of the vesting start date and the remainder vesting quarterly over the next 12 quarters, subject to the grantee’s continued service to the Company. RSUs granted to existing employees generally vest quarterly over a period of four years, subject to the grantee’s continued service to the Company.

The following table summarizes RSU activity for the three months ended April 30, 2019:



	Shares		Weighted-Average Grant Date Fair Value per RSU
Unvested - January 31, 2019	1,988,774		$	54.22
RSUs granted	1,027,610		105.50
RSUs vested	(126,346	)	45.42
RSUs forfeited and canceled	(24,629	)	56.03
Unvested - April 30, 2019	2,865,409		$	72.98

Stock-Based Compensation Expense

Total stock-based compensation expense recognized in the Company’s unaudited condensed consolidated statements of operations is as follows (in thousands):



	Three Months Ended April 30,
	2019		2018
Cost of revenue—subscription	$	988	$	359
Cost of revenue—services	593		184
Sales and marketing	4,940		2,218
Research and development	4,520		2,206
General and administrative	2,968		2,610
Total stock-based compensation expense	$	14,009	$	7,577

Net Loss per Share

3 Months Ended

Apr. 30, 2019

Earnings Per Share [Abstract]

Net Loss per Share

The Company calculates basic net loss per share by dividing the net loss by the weighted-average number of shares of common stock outstanding during the period, less shares subject to repurchase. Diluted net loss per share is computed by giving effect to all potentially dilutive common stock equivalents outstanding for the period, including stock options and restricted stock units. Basic and diluted net loss per share was the same for each period presented, as the inclusion of all potential common shares outstanding would have been anti-dilutive due to the net loss reported for each period presented.

The rights, including the liquidation and dividend rights, of the holders of Class A and Class B common stock are identical, except with respect to voting. Each share of Class A common stock is entitled to one vote per share and each share of Class B common stock is entitled to 10 votes per share. As the liquidation and dividend rights are identical for Class A and Class B common stock, the undistributed earnings are allocated on a proportionate basis and the resulting net loss per share will, therefore, be the same for both Class A and Class B common stock on an individual or combined basis.

The following table sets forth the computation of basic and diluted net loss per share (in thousands, except share and per share data):



	Three Months Ended April 30,
	2019			2018
Numerator:
Net loss	$	(33,240	)	$	(26,555	)

Denominator:
Weighted-average shares used to compute net loss per share, basic and diluted	54,710,746			50,350,052

Net loss per share, basic and diluted	$	(0.61	)	$	(0.53	)

The shares underlying the conversion option in the Notes were not considered in the calculation of diluted net loss per share as the effect would have been anti-dilutive. Based on the initial conversion price, the entire outstanding principal amount of the Notes as of April 30, 2019 would have been convertible into approximately 4.4 million shares of the Company’s Class A common stock. However, the Company currently expects to settle the principal amount of the Notes in cash. As a result, only the amount by which the conversion value exceeds the aggregate principal amount of the Notes (the “conversion spread”) is considered in the diluted earnings per share computation under the treasury stock method. The conversion spread has a dilutive impact on diluted net income per share when the average market price of the Company’s Class A common stock for a given period exceeds the initial conversion price of $68.15 per share for the Notes. In connection with the issuance of the Notes, the Company entered into Capped Calls, which were not included for purposes of calculating the number of diluted shares outstanding, as their effect would have been anti-dilutive. The Capped Calls are expected to partially offset the potential dilution to the Company’s Class A common stock upon any conversion of the Notes.

During the three months ended April 30, 2019, the average market price of the Company’s Class A common stock was $122.10, which exceeded the initial conversion price. The Company had not received any conversion notices through the issuance date of these unaudited condensed consolidated financial statements. For disclosure purposes, the Company calculated the potentially dilutive effect of the conversion spread, which is included in the table below.

The following weighted-average outstanding potentially dilutive shares of common stock were excluded from the computation of diluted net loss per share for the periods presented because the impact of including them would have been anti-dilutive.



	Three Months Ended April 30,
	2019	2018
Stock options to purchase Class A common stock	2,471,439	3,539,338
Stock options to purchase Class B common stock	5,700,441	9,001,291
Unvested restricted stock units	2,561,471	646,518
Early exercised stock options	47,550	234,646
Shares underlying the conversion spread in the convertible senior notes	1,945,081	—

Income Taxes	3 Months Ended
Income Taxes	Apr. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Company recorded a provision (benefit) related to income taxes of $(0.1) million and $0.5 million for the three months ended April 30, 2019 and 2018, respectively. The provision (benefit) related to income taxes was primarily due to foreign taxes offset by excess tax deductions in the United Kingdom with respect to stock option exercises. The calculation of income taxes is based upon the estimated annual effective tax rates for the year applied to the current period income (loss) before tax plus the tax effect of any significant unusual items, discrete events or changes in tax law. The Company assesses uncertain tax positions in accordance with ASC 740-10, Accounting for Uncertainties in Tax. As of April 30, 2019, the Company’s net unrecognized tax benefits totaled $4.6 million, of which $0.1 million would impact the Company’s effective tax rate if recognized. The Company anticipates that the amount of reasonably possible unrecognized tax benefits that could decrease over the next twelve months due to the expiration of certain statutes of limitations and settlement of tax audits is not material to the Company’s interim unaudited condensed consolidated financial statements.

Subsequent Events	3 Months Ended
Subsequent Events	Apr. 30, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On April 23, 2019, the Company entered into an Agreement and Plan of Merger Agreement (the “Merger Agreement”) with Kingdom Merger Sub, Inc., a wholly-owned subsidiary of the Company (“Merger Sub”), Tightdb, Inc. (“Realm”), and Fortis Advisors LLC, solely in its capacity as the Stockholder Agent, to acquire all of the issued and outstanding capital stock of Realm for a purchase price of $39.0 million in cash, subject to working capital, cash, debt, transaction expenses and other closing adjustments. Realm was a privately held mobile database company. Pursuant to the Merger Agreement, on May 7, 2019, Merger Sub was merged with and into Realm, and Realm continued as the surviving corporation and as a wholly-owned subsidiary of the Company. The Merger Agreement contains customary representations and warranties of each of the parties. The Merger Agreement also contains indemnification rights whereby the Company and its subsidiaries will be indemnified for breaches of or inaccuracies in counterparty representations, warranties, covenants and certain other matters (subject to certain limitations). In connection with the transaction, certain employees of Realm have accepted offers of employment made by the Company to continue with the Company following the closing of the Merger.

Summary of Significant Accounting Policies (Policies)	3 Months Ended
Summary of Significant Accounting Policies (Policies)	Apr. 30, 2019
Accounting Policies [Abstract]
Basis of Presentation	The interim unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and include the accounts of the Company and its wholly owned subsidiaries. All intercompany transactions and accounts have been eliminated. Certain information and note disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to the applicable rules and regulations of the Securities and Exchange Commission (“SEC”). The condensed balance sheet data as of January 31, 2019 was derived from the Company’s audited financial statements, but does not include all disclosures required by U.S. GAAP. Therefore, these interim unaudited condensed consolidated financial statements and accompanying footnotes should be read in conjunction with the Company’s annual consolidated financial statements and related footnotes included in its Annual Report on Form 10-K for the fiscal year ended January 31, 2019 (the “2019 Form 10-K”).
Use of Estimates	The preparation of the interim unaudited condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting period. Such estimates include, but are not limited to, revenue recognition, allowances for doubtful accounts, stock-based compensation, legal contingencies, fair value of acquired intangible assets and goodwill, useful lives of acquired intangible assets and property and equipment, fair value of property and equipment and accounting for income taxes. The Company bases these estimates on historical and anticipated results, trends and various other assumptions that it believes are reasonable under the circumstances, including assumptions as to future events. Actual results could differ from those estimates.
Related Party Transactions	All contracts with related parties are executed in ordinary course of business.
New Accounting Pronouncements Not Yet Adopted	Leases. In February 2016, the Financial Accounting Standards Board issued Accounting Standards Update (“ASU”) 2016-02, codified as Accounting Standards Codification 842 (“ASC 842”), which requires lessees to record the assets and liabilities arising from all leases, with the exception of short-term leases, on the balance sheet. Under ASC 842, lessees will recognize a liability for lease payments and a right-of-use asset. This guidance retains the distinction between finance leases and operating leases and the classification criteria for finance leases remains similar. For finance leases, a lessee will recognize the interest on a lease liability separate from amortization of the right-of-use asset. In addition, repayments of principal will be presented within financing activities, and interest payments will be presented within operating activities in the statement of cash flows. For operating leases, a lessee will recognize a single lease cost on a straight-line basis and classify all cash payments within operating activities in the statement of cash flows. The Company adopted the new lease accounting standard effective February 1, 2019 using the additional transition method described in ASU No. 2018-11, Leases – Targeted Improvements, which was issued in July 2018. Under the additional transition method, the Company recognized the cumulative effect of initially applying the guidance as an adjustment to the operating lease right-of-use assets and operating lease liabilities on its condensed consolidated balance sheet on February 1, 2019 without retrospective application to comparative periods. The adoption of ASC 842 resulted in recognition of right-of-use assets of $53.7 million, which included the impact of existing deferred rents of $2.9 million and lease liabilities of $70.2 million, along with a cumulative impact of $4.1 million on the opening accumulated deficit, as of February 1, 2019. The Company elected the package of practical expedients permitted under the transition guidance within ASC 842, which allowed the Company to carry forward its historical assessments of whether contracts are or contain leases, lease classification and initial direct costs. See Note 5, Leases, for additional details. The Company determines if an arrangement is, or contains, a lease at inception. Operating leases are disclosed separately on the consolidated balance sheets and the finance lease is included in property and equipment, net, other accrued liabilities and other liabilities, non-current. The Company has elected an accounting policy to not recognize short-term leases (one year or less) on the consolidated balance sheet. Operating lease right of use assets and operating lease liabilities are recognized based on the present value of the lease payments over the lease term at commencement date. As all of the Company’s leases do not provide an implicit rate, the Company’s incremental borrowing rate is used based on the information available at commencement date in determining the present value of future payments. The operating lease right of use asset also includes any lease payments made and excludes lease incentives. Lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term. The Company accounts for lease components and non-lease components as a single lease component. Stock-Based Compensation. In June 2018, the FASB issued ASU No. 2018-07, Compensation - Stock Compensation (Topic 718): Improvements to Non-employee Share-Based Payment Accounting, which expands the scope of Topic 718 to include share-based payment transactions for acquiring goods and services from non-employees, with certain exceptions. The new guidance was effective for the Company for fiscal year beginning February 1, 2019 and the adoption had no material impact on its consolidated financial statements. New Accounting Pronouncements Not Yet Adopted Goodwill Impairment. In January 2017, the FASB issued ASU 2017-04—Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The new standard simplifies the measurement of goodwill by eliminating step two of the two-step impairment test. Step two measures a goodwill impairment loss by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of that goodwill. The new guidance requires an entity to compare the fair value of a reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value. Additionally, an entity should consider income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. The new guidance becomes effective for the Company for the fiscal year beginning February 1, 2020, though early adoption is permitted. The Company does not expect the adoption of the new accounting standard to have a material impact on its consolidated financial statements. Cloud Computing. In August 2018, the FASB issued ASU 2018-15, Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract, which aligns the accounting for implementation costs incurred in a hosting arrangement that is a service contract with the accounting for implementation costs incurred to develop or obtain internal-use software under ASC 350-40, in order to determine which costs to capitalize and recognize as an asset and which costs to expense. ASU 2018-15 becomes effective for the Company for the fiscal year beginning February 1, 2020, with early adoption permitted, and can be applied either prospectively to implementation costs incurred after the date of adoption or retrospectively to all arrangements. The Company is currently evaluating the impact of the adoption of this standard on its consolidated financial statements. Credit Losses. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which requires the measurement and recognition of expected credit losses for financial assets held at amortized cost, which includes the Company's accounts receivables, certain financial instruments and contract assets. ASU 2016-13 replaces the existing incurred loss impairment model with an expected loss methodology, which will result in more timely recognition of credit losses. For available-for-sale debt securities, credit losses should be recorded through an allowance for credit losses. ASU 2016-13 becomes effective for the Company for the fiscal year beginning February 1, 2020 and requires a cumulative effect adjustment to the balance sheet as of the beginning of the first reporting period in which the guidance is effective. The Company is evaluating the impact of the adoption of ASU 2016-13 on its consolidated financial statements.
Net Loss per Share	The Company calculates basic net loss per share by dividing the net loss by the weighted-average number of shares of common stock outstanding during the period, less shares subject to repurchase. Diluted net loss per share is computed by giving effect to all potentially dilutive common stock equivalents outstanding for the period, including stock options and restricted stock units. Basic and diluted net loss per share was the same for each period presented, as the inclusion of all potential common shares outstanding would have been anti-dilutive due to the net loss reported for each period presented. The rights, including the liquidation and dividend rights, of the holders of Class A and Class B common stock are identical, except with respect to voting. Each share of Class A common stock is entitled to one vote per share and each share of Class B common stock is entitled to 10 votes per share. As the liquidation and dividend rights are identical for Class A and Class B common stock, the undistributed earnings are allocated on a proportionate basis and the resulting net loss per share will, therefore, be the same for both Class A and Class B common stock on an individual or combined basis.
Income Taxes	The Company assesses uncertain tax positions in accordance with ASC 740-10, Accounting for Uncertainties in Tax.

- Definition

Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.

+ References + Details

Fair Value Measurements (Tables)

3 Months Ended

Apr. 30, 2019

Fair Value Disclosures [Abstract]

Schedule of financial assets and liabilities measured at fair value on a recurring basis



	Fair Value Measurement at April 30, 2019
	Level 1		Level 2		Level 3		Total
Financial Assets:
Cash and cash equivalents:
Money market funds	$	50,356	$	—	$	—	$	50,356
Short-term investments:
U.S. government treasury securities	318,346		—		—		318,346
Total financial assets	$	368,702	$	—	$	—	$	368,702



	Fair Value Measurement at January 31, 2019
	Level 1		Level 2		Level 3		Total
Financial Assets:
Cash and cash equivalents:
Money market funds	$	88,015	$	—	$	—	$	88,015
Short-term investments:
U.S. government treasury securities	318,139		—		—		318,139
Total financial assets	$	406,154	$	—	$	—	$	406,154

Convertible Senior Notes (Tables)

3 Months Ended

Apr. 30, 2019

Debt Disclosure [Abstract]

Convertible debt schedules

The net carrying amount of the liability component of the Notes was as follows (in thousands):



	April 30, 2019
Principal	$	300,000
Unamortized debt discount	(74,178		)
Unamortized debt issuance costs	(5,743		)
Net carrying amount	$	220,079

The net carrying amount of the equity component of the Notes was as follows (in thousands):



	April 30, 2019
Debt discount for conversion option	$	84,168
Issuance costs	(2,485		)
Net carrying amount	$	81,683

Interest expense related to Notes

The following table sets forth the interest expense related to the Notes (in thousands):



	Three Months Ended April 30,
	2019		2018
Contractual interest expense	$	563	$	—
Amortization of debt discount	3,033		—
Amortization of issuance costs	188		—
Total	$	3,784	$	—

Leases (Tables)

3 Months Ended

Apr. 30, 2019

Leases [Abstract]

Lease, Cost



	Three Months Ended April 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from finance lease	$	—
Operating cash flows from operating leases	1,032
Financing cash flows from finance lease	—
Right-of-use assets obtained in exchange for lease obligations:
Finance lease	$	—
Operating leases	2,269
Weighted-average remaining lease term (in years):
Finance lease	10.7
Operating leases	4.8
Weighted-average discount rate:
Finance lease	5.6		%
Operating leases	6.1		%

The components of the Company’s lease costs included in its condensed consolidated statement of operations were as follows (in thousands):



	Three Months Ended April 30, 2019
Finance lease cost:
Amortization of right-of-use assets	$	994
Interest on lease liabilities	905
Operating lease cost	967
Short-term lease cost	395
Total lease cost	$	3,261

Assets And Liabilities, Lessee

The balances of the Company’s operating and finance leases were recorded on the condensed consolidated balance sheet as follows (in thousands):



	April 30, 2019
Operating Leases:
Operating lease right-of-use assets	$	12,378
Operating lease liabilities (current)	3,575
Operating lease liabilities, non-current	9,827
Finance Lease:
Property and equipment, net	$	42,392
Other accrued liabilities	2,133
Other liabilities, non-current	62,755

Finance Lease, Liability, Maturity

Future minimum lease payments under non-cancelable finance and operating leases on an annual undiscounted cash flow basis as of April 30, 2019 were as follows (in thousands):



Year Ending January 31,	Finance Lease			Operating Leases
Remainder of 2020	$	3,732		$	4,017
2021	8,073			4,189
2022	8,073			2,579
2023	8,073			2,529
2024	8,073			1,014
Thereafter	51,274			2,103
Total minimum payments	87,298			16,431
Less imputed interest	(22,410		)	(3,029		)
Present value of future minimum lease payments	64,888			13,402
Less current obligations under leases	(2,133		)	(3,575		)
Non-current lease obligations	$	62,755		$	9,827

Lessee, Operating Lease, Liability, Maturity

Future minimum lease payments under non-cancelable finance and operating leases on an annual undiscounted cash flow basis as of April 30, 2019 were as follows (in thousands):



Year Ending January 31,	Finance Lease			Operating Leases
Remainder of 2020	$	3,732		$	4,017
2021	8,073			4,189
2022	8,073			2,579
2023	8,073			2,529
2024	8,073			1,014
Thereafter	51,274			2,103
Total minimum payments	87,298			16,431
Less imputed interest	(22,410		)	(3,029		)
Present value of future minimum lease payments	64,888			13,402
Less current obligations under leases	(2,133		)	(3,575		)
Non-current lease obligations	$	62,755		$	9,827

Schedule of Future Minimum Lease Payments for Capital Leases

Future minimum lease payments under non-cancelable financing and operating leases, based on the previous lease accounting standard, as of January 31, 2019, were as follows (in thousands):



Year Ending January 31,	Financing Lease		Operating Leases
2020	$	3,732	$	4,578
2021	8,073		3,765
2022	8,073		2,277
2023	8,073		2,224
2024	8,073		922
Thereafter	51,274		2,149
Total minimum payments	$	87,298	$	15,915

Schedule of Future Minimum Rental Payments for Operating Leases

Future minimum lease payments under non-cancelable financing and operating leases, based on the previous lease accounting standard, as of January 31, 2019, were as follows (in thousands):



Year Ending January 31,	Financing Lease		Operating Leases
2020	$	3,732	$	4,578
2021	8,073		3,765
2022	8,073		2,277
2023	8,073		2,224
2024	8,073		922
Thereafter	51,274		2,149
Total minimum payments	$	87,298	$	15,915

Revenue (Tables)

3 Months Ended

Apr. 30, 2019

Revenues [Abstract]

Schedule of total revenue by geographic areas

The following table presents the Company’s revenues disaggregated by primary geographical markets, subscription product categories and services (in thousands):



	Three Months Ended April 30,
	2019		2018
Primary geographical markets:
Americas	$	57,756	$	33,420
EMEA	25,320		14,024
Asia Pacific	6,312		2,695
Total	$	89,388	$	50,139

Subscription product categories and services:
MongoDB Atlas-related	$	30,863	$	6,963
Other subscription	53,131		39,106
Services	5,394		4,070
Total	$	89,388	$	50,139

Equity Incentive Plans and Employee Stock Purchase Plan (Tables)

3 Months Ended

Apr. 30, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of stock option activity

The following table summarizes stock option activity for the three months ended April 30, 2019 (in thousands, except share and per share data and years):



	Shares		Weighted- Average Exercise Price Per Share		Weighted- Average Remaining Contractual Term (In Years)	Aggregate Intrinsic Value
Balance - January 31, 2019	8,621,010		$	7.75	6.7	$	729,392
Stock options exercised	(831,901	)	7.71
Stock options forfeited and expired	(77,121	)	10.45
Balance - April 30, 2019	7,711,988		7.73		6.5	1,027,149
Vested and exercisable - January 31, 2019	5,342,183		6.95		6.0	456,275
Vested and exercisable - April 30, 2019	4,917,890		$	6.95	5.9	$	658,851

Schedule of restricted stock unit activity

The following table summarizes RSU activity for the three months ended April 30, 2019:



	Shares		Weighted-Average Grant Date Fair Value per RSU
Unvested - January 31, 2019	1,988,774		$	54.22
RSUs granted	1,027,610		105.50
RSUs vested	(126,346	)	45.42
RSUs forfeited and canceled	(24,629	)	56.03
Unvested - April 30, 2019	2,865,409		$	72.98

Schedule of stock-based compensation expense recognized in consolidated statements of operations

Total stock-based compensation expense recognized in the Company’s unaudited condensed consolidated statements of operations is as follows (in thousands):



	Three Months Ended April 30,
	2019		2018
Cost of revenue—subscription	$	988	$	359
Cost of revenue—services	593		184
Sales and marketing	4,940		2,218
Research and development	4,520		2,206
General and administrative	2,968		2,610
Total stock-based compensation expense	$	14,009	$	7,577

Net Loss per Share (Tables)

3 Months Ended

Apr. 30, 2019

Earnings Per Share [Abstract]

Schedule of basic and diluted earnings (loss) per share

The following table sets forth the computation of basic and diluted net loss per share (in thousands, except share and per share data):



	Three Months Ended April 30,
	2019			2018
Numerator:
Net loss	$	(33,240	)	$	(26,555	)

Denominator:
Weighted-average shares used to compute net loss per share, basic and diluted	54,710,746			50,350,052

Net loss per share, basic and diluted	$	(0.61	)	$	(0.53	)

Schedule of antidilutive securities excluded from computation of earnings per share



	Three Months Ended April 30,
	2019	2018
Stock options to purchase Class A common stock	2,471,439	3,539,338
Stock options to purchase Class B common stock	5,700,441	9,001,291
Unvested restricted stock units	2,561,471	646,518
Early exercised stock options	47,550	234,646
Shares underlying the conversion spread in the convertible senior notes	1,945,081	—

Summary of Significant Accounting Policies (Details) - USD ($)	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Feb. 01, 2019	Jan. 31, 2019
Accounting Policies [Abstract]
Related party transactions	$ 0	$ 0
Amounts payable to or receivable from related parties	0			$ 0
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred rent credit	12,378,000			$ 0
Lease liability	$ 13,402,000
Cumulative effect of accounting change			$ 4,103,000
Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of accounting change			4,103,000
Accounting Standards Update 2016-19
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred rent credit			53,700,000
Deferred revenue			2,900,000
Lease liability			70,200,000
Accounting Standards Update 2016-19 \| Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of accounting change			$ 4,100,000

Fair Value Measurements - Schedule of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Apr. 30, 2019	Jan. 31, 2019
Short-term investments:
Total financial assets	$ 368,702	$ 406,154
Level 1
Short-term investments:
Total financial assets	368,702	406,154
Level 2
Short-term investments:
Total financial assets	0	0
Level 3
Short-term investments:
Total financial assets	0	0
U.S. government treasury securities
Short-term investments:
Short-term investments:	318,346	318,139
U.S. government treasury securities \| Level 1
Short-term investments:
Short-term investments:	318,346	318,139
U.S. government treasury securities \| Level 2
Short-term investments:
Short-term investments:	0	0
U.S. government treasury securities \| Level 3
Short-term investments:
Short-term investments:	0	0
Money Market Funds
Cash and cash equivalents:
Cash and cash equivalents:	50,356	88,015
Money Market Funds \| Level 1
Cash and cash equivalents:
Cash and cash equivalents:	50,356	88,015
Money Market Funds \| Level 2
Cash and cash equivalents:
Cash and cash equivalents:	0	0
Money Market Funds \| Level 3
Cash and cash equivalents:
Cash and cash equivalents:	$ 0	$ 0

Convertible Senior Notes - Additional Information (Details)	2 Months Ended	3 Months Ended
	Jul. 31, 2018 USD ($) day $ / shares	Apr. 30, 2019 USD ($) day $ / shares	Jun. 30, 2018 USD ($)
Debt Instrument [Line Items]
Proceeds from borrowings on convertible senior notes, net of issuance costs	$ 291,100,000
Convertible debt, conversion ratio	14.6738
Convertible debt, conversion ratio denominator	$ 1,000
Initial conversion price (in dollars per share) \| $ / shares	$ 68.15	$ 68.15
Consecutive threshold trading days \| day	30	30
Threshold percentage of stock price trigger	130.00%	130.00%
Carrying amount of convertible debt equity component	$ 84,200,000
Fair value of convertible debt		$ 630,800,000
Minimum
Debt Instrument [Line Items]
Threshold trading days \| day	20	20
Redemption Period 1
Debt Instrument [Line Items]
Consecutive threshold trading days \| day	30
Threshold percentage of stock price trigger	130.00%
Redemption Period 1 \| Minimum
Debt Instrument [Line Items]
Threshold trading days \| day	20
Redemption Period 2
Debt Instrument [Line Items]
Convertible debt, conversion ratio denominator	$ 1,000
Threshold trading days \| day	5
Consecutive threshold trading days \| day	5
Redemption Period 2 \| Maximum
Debt Instrument [Line Items]
Trading price as a percentage of stock price and debt conversion rate	98.00%
Convertible Debt
Debt Instrument [Line Items]
Face amount of debt	$ 50,000,000		$ 250,000,000
Interest rate	0.75%		0.75%
Convertible debt, conversion ratio denominator		$ 100
Percentage of principal amount redeemed	100.00%
Debt issuance costs	$ 8,800,000
Effective interest rate	7.03%
Convertible Debt \| Convertible Senior Notes, Liability Component
Debt Instrument [Line Items]
Debt issuance costs	$ 6,300,000	5,743,000
Convertible Debt \| Convertible Senior Notes, Equity Component
Debt Instrument [Line Items]
Carrying amount of convertible debt equity component		84,168,000
Debt issuance costs	$ 2,500,000	$ 2,485,000

Convertible Senior Notes - Schedule of Net Carrying Amount of the Liability Component of the Notes (Details) - Convertible Debt - USD ($) $ in Thousands	Apr. 30, 2019	Jul. 31, 2018
Debt Instrument [Line Items]
Unamortized debt issuance costs		$ (8,800)
Convertible Senior Notes, Liability Component
Debt Instrument [Line Items]
Principal	$ 300,000
Unamortized debt discount	(74,178)
Unamortized debt issuance costs	(5,743)	$ (6,300)
Net carrying amount	$ 220,079

Convertible Senior Notes - Schedule of Net Carrying Amount of the Equity Component of the Notes (Details) - USD ($) $ in Thousands	Apr. 30, 2019	Jul. 31, 2018
Debt Instrument [Line Items]
Debt discount for conversion option		$ 84,200
Convertible Debt
Debt Instrument [Line Items]
Issuance costs		(8,800)
Convertible Senior Notes, Equity Component \| Convertible Debt
Debt Instrument [Line Items]
Debt discount for conversion option	$ 84,168
Issuance costs	(2,485)	$ (2,500)
Net carrying amount	$ 81,683

Convertible Senior Notes - Schedule of Interest Expense for the Notes (Details) - Convertible Debt - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Debt Instrument [Line Items]
Contractual interest expense	$ 563	$ 0
Amortization of debt discount	3,033	0
Amortization of issuance costs	188	0
Total	$ 3,784	$ 0

Convertible Senior Notes - Capped Calls (Details) $ / shares in Units, shares in Millions, $ in Millions	2 Months Ended
	Jul. 31, 2018 USD ($) $ / shares shares
Option Indexed to Issuer's Equity [Line Items]
Purchase of capped calls \| $	$ 37.1
Capped Calls
Option Indexed to Issuer's Equity [Line Items]
Strike price (in dollars per share)	$ 68.15
Cap price (in dollars per share)	$ 106.90
Capped Calls \| Class A Common Stock
Option Indexed to Issuer's Equity [Line Items]
Underlying capped calls (in shares) \| shares	4.4

Leases - Narrative (Details) $ in Thousands	3 Months Ended
Leases - Narrative (Details) $ in Thousands	Apr. 30, 2019 USD ($) ft²
Leases [Abstract]
Rentable office space (in sq ft) \| ft²	106,230
Term of contract	12 years
Total minimum payments \| $	$ 87,298
Term before initial payment	18 months
Option to extend	P5Y

Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Finance lease cost:
Amortization of right-of-use assets	$ 994	$ 0
Interest on lease liabilities	905	$ 0
Operating lease cost	967
Short-term lease cost	395
Total lease cost	$ 3,261

Leases - Balance Sheet Components (Details) - USD ($) $ in Thousands	Apr. 30, 2019	Jan. 31, 2019
Operating Leases:
Operating lease right-of-use assets	$ 12,378	$ 0
Operating lease liabilities (current)	3,575	0
Operating lease liabilities, non-current	9,827	$ 0
Finance Lease:
Property and equipment, net	42,392
Other accrued liabilities	2,133
Other liabilities, non-current	$ 62,755

Leases - Supplemental Information (Details) $ in Thousands	3 Months Ended
Leases - Supplemental Information (Details) $ in Thousands	Apr. 30, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from finance lease	$ 0
Operating cash flows from operating leases	1,032
Financing cash flows from finance lease	0
Right-of-use assets obtained in exchange for lease obligations:
Finance lease	0
Operating leases	$ 2,269
Weighted-average remaining lease term (in years):
Finance lease	10 years 8 months 12 days
Operating leases	4 years 9 months 18 days
Weighted-average discount rate:
Finance lease	5.60%
Operating leases	6.10%

Leases - Lease Maturities (Details) - USD ($) $ in Thousands	Apr. 30, 2019	Jan. 31, 2019
Finance Lease Liabilities, Payments, Due [Abstract]
Remainder of 2020	$ 3,732
2021	8,073
2022	8,073
2023	8,073
2024	8,073
Thereafter	51,274
Total minimum payments	87,298
Less imputed interest	(22,410)
Present value of future minimum lease payments	64,888
Less current obligations under leases	(2,133)
Non-current lease obligations	62,755
Operating Lease Liabilities, Payments Due [Abstract]
Remainder of 2020	4,017
2021	4,189
2022	2,579
2023	2,529
2024	1,014
Thereafter	2,103
Total minimum payments	16,431
Less imputed interest	(3,029)
Present value of future minimum lease payments	13,402
Less current obligations under leases	(3,575)	$ 0
Non-current lease obligations	$ 9,827	$ 0

Leases - Lease Maturities Prior To Adoption of New Lease Standard (Details) $ in Thousands	Jan. 31, 2019 USD ($)
Financing Lease
2020	$ 3,732
2021	8,073
2022	8,073
2023	8,073
2024	8,073
Thereafter	51,274
Total minimum payments	87,298
Operating Leases
2020	4,578
2021	3,765
2022	2,277
2023	2,224
2024	922
Thereafter	2,149
Total minimum payments	$ 15,915

Commitments and Contingencies (Details) - USD ($)	Apr. 30, 2019	Jan. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Accrual for contingencies	$ 0	$ 0

Revenue - Schedule of total revenue by geographic areas (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 89,388	$ 50,139
MongoDB Atlas-related
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	30,863	6,963
Other subscription
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	53,131	39,106
Services
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	5,394	4,070
Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	57,756	33,420
Europe, Middle East and Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	25,320	14,024
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 6,312	$ 2,695

Revenue - Concentration Risk (Details) - Geographic Concentration Risk - Revenue, Net	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
United States
Concentration Risk [Line Items]
Concentration risk, percentage	60.00%	63.00%
United Kingdom
Concentration Risk [Line Items]
Concentration risk, percentage	10.00%	9.00%

Revenue - Additional Information (Details) - USD ($)	3 Months Ended
Revenue - Additional Information (Details) - USD ($)	Apr. 30, 2019	Apr. 30, 2018
Revenues [Abstract]
Deferred revenue	$ 143,700,000	$ 137,700,000
Revenue recognized	45,100,000	30,300,000
Remaining performance obligation	$ 178,800,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected timing of satisfaction of remaining performance obligation	12 months
Unbilled receivables	$ 7,900,000
Deferred commissions	51,600,000
Amortization of deferred commissions	4,400,000	3,100,000
Impairment loss	$ 0	$ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-05-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, percentage	53.00%

Equity Incentive Plans and Employee Stock Purchase Plan - Stock Options (Details) - Employee Stock Option	3 Months Ended
	Apr. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
One Year Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights percentage	25.00%
13 to 36 Months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights percentage	75.00%

Equity Incentive Plans and Employee Stock Purchase Plan - Schedule of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Apr. 30, 2019	Jan. 31, 2019
Shares
Balance - beginning of period (in shares)	8,621,010
Stock options exercised (in shares)	(831,901)
Stock options forfeited and expired (in shares)	(77,121)
Balance - end of period (in shares)	7,711,988	8,621,010
Vested and exercisable (in shares)	4,917,890	5,342,183
Weighted- Average Exercise Price Per Share
Balance - beginning of period (in dollars per share)	$ 7.75
Stock options exercised (in dollars per share)	7.71
Stock options forfeited and expired (in dollars per share)	10.45
Balance - end of period (in dollars per share)	7.73	$ 7.75
Vested and exercisable (in dollars per share)	$ 6.95	$ 6.95
Weighted- Average Remaining Contractual Term (In Years)
Balance	6 years 6 months 11 days	6 years 8 months 12 days
Vested and exercisable	5 years 10 months 28 days	6 years
Aggregate Intrinsic Value
Balance	$ 1,027,149	$ 729,392
Vested and exercisable	$ 658,851	$ 456,275

Equity Incentive Plans and Employee Stock Purchase Plan - Restricted Stock Units, Additional Information (Details) - Restricted Stock Units (RSUs)	3 Months Ended
	Apr. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
One Year Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Vesting rights percentage	25.00%
13 to 36 Months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights percentage	75.00%

Equity Incentive Plans and Employee Stock Purchase Plan - Schedule of Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs)	3 Months Ended
	Apr. 30, 2019 $ / shares shares
Shares
Unvested - beginning of period (in shares) \| shares	1,988,774
RSUs granted (in shares) \| shares	1,027,610
RSUs vested (in shares) \| shares	(126,346)
RSUs forfeited and canceled (in shares) \| shares	(24,629)
Unvested - end of period (in shares) \| shares	2,865,409
Weighted-Average Grant Date Fair Value per RSU
Unvested - beginning of period (in dollars per share) \| $ / shares	$ 54.22
RSUs granted (in dollars per share) \| $ / shares	105.50
RSUs vested (in dollars per share) \| $ / shares	45.42
RSUs forfeited and canceled (in dollars per share) \| $ / shares	56.03
Unvested - end of period (in dollars per share) \| $ / shares	$ 72.98

Equity Incentive Plans and Employee Stock Purchase Plan - Stock-based Compensation Expense Recognized in Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 14,009	$ 7,577
Cost of revenue—subscription
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	988	359
Cost of revenue—services
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	593	184
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	4,940	2,218
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	4,520	2,206
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 2,968	$ 2,610

Net Loss per Share - Additional Information (Details) shares in Millions	3 Months Ended
	Apr. 30, 2019 $ / shares shares	Jul. 31, 2018 $ / shares
Class of Stock [Line Items]
Shares issuable upon conversion (in shares) \| shares	4.4
Initial conversion price (in dollars per share)	$ 68.15	$ 68.15
Average market price (in dollars per share)	$ 122.10
Class A Common Stock
Class of Stock [Line Items]
Number of votes per share	1
Class B Common Stock
Class of Stock [Line Items]
Number of votes per share	10

Net Loss per Share - Schedule of Basic and Diluted Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Numerator:
Net loss	$ (33,240)	$ (26,555)
Denominator:
Weighted-average shares used to compute net loss per share, basic and diluted (in shares)	54,710,746	50,350,052
Net loss per share, basic and diluted (in dollars per share)	$ (0.61)	$ (0.53)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Net Loss per Share - Schedule of Antidilutive Securities Excluded from the Computation of Diluted Net Loss per Share (Details) - shares	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Stock options to purchase common stock \| Class A Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	2,471,439	3,539,338
Stock options to purchase common stock \| Class B Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	5,700,441	9,001,291
Unvested restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	2,561,471	646,518
Early exercised stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	47,550	234,646
Shares underlying the conversion spread in the convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	1,945,081	0

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Apr. 30, 2019	Apr. 30, 2018
Income Tax Disclosure [Abstract]
Provision (benefit) for income taxes	$ (138)	$ 467
Unrecognized tax benefits	4,600
Unrecognized tax benefits that would impact effective tax rate	100
Decrease in unrecognized tax benefits is reasonably possible	$ 0

Subsequent Events (Details) $ in Millions	May 07, 2019 USD ($)
Subsequent Event \| Kingdom Merger Sub, Inc and Tightdb, Inc. Merger
Subsequent Event [Line Items]
Business combination, consideration transferred	$ 39.0