Box (BOX) 10-Q 12 Jun 15 2016 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Apr. 30, 2015	31-May-15
Document And Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	30-Apr-15
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q1
Trading Symbol	BOX
Entity Registrant Name	BOX INC
Entity Central Index Key	1372612
Current Fiscal Year End Date	-30
Entity Filer Category	Non-accelerated Filer
Class A Common Stock
Document And Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		19,609,457
Class B Common Stock
Document And Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		101,308,042

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Apr. 30, 2015	Jan. 31, 2015
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents	$179,987	$330,436
Marketable securities	103,989
Accounts receivable, net of allowance of $3,945 and $3,858	38,551	54,174
Prepaid expenses and other current assets	39,256	12,132
Deferred commissions	9,097	9,487
Total current assets	370,880	406,229
Property and equipment, net	59,259	58,446
Intangible assets, net	5,546	6,343
Goodwill	11,657	11,242
Restricted cash	28,367	3,367
Other long-term assets	6,202	7,039
Total assets	481,911	492,666
Current liabilities:
Accounts payable	15,089	17,486
Accrued compensation and benefits	18,494	20,486
Accrued expenses and other current liabilities	16,027	16,862
Capital lease obligations, current	1,172	625
Deferred revenue	111,545	107,893
Deferred rent	3,623	2,701
Total current liabilities	165,950	166,053
Debt, non-current	40,000	40,000
Capital lease obligations, non-current	2,139	1,238
Deferred revenue, non-current	12,656	12,164
Deferred rent, non-current	28,211	3,890
Other long-term liabilities	1,966	1,192
Total liabilities	250,922	224,537
Commitments and contingencies (Note 8)
Stockholders’ equity:
Preferred stock, par value $0.0001 per share; 100,000 shares authorized, no shares issued and outstanding as of April 30, 2015 (unaudited) and January 31, 2015, respectively
Additional paid-in capital	808,891	798,743
Treasury stock	-1,177	-1,177
Accumulated other comprehensive loss	-61	-56
Accumulated deficit	-576,676	-529,393
Total stockholders’ equity	230,989	268,129
Total liabilities and stockholders’ equity	481,911	492,666
Class A Common Stock
Stockholders’ equity:
Common stock, value	2	1
Class B Common Stock
Stockholders’ equity:
Common stock, value	$10	$11

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Apr. 30, 2015	Jan. 31, 2015
In Thousands, except Share data, unless otherwise specified
Allowance for accounts receivable	$3,945	$3,858
Preferred stock, par value	$0.00	$0.00
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Class A Common Stock
Common Stock, par value	$0.00	$0.00
Common Stock, shares authorized	1,000,000,000	1,000,000,000
Common Stock, shares issued	18,034,000	14,455,000
Common Stock, shares outstanding	18,034,000	14,455,000
Class B Common Stock
Common Stock, par value	$0.00	$0.00
Common Stock, shares authorized	200,000,000	200,000,000
Common Stock, shares issued	102,332,000	105,200,000
Common Stock, shares outstanding	102,332,000	105,200,000

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Apr. 30, 2015	Apr. 30, 2014
Income Statement [Abstract]
Revenue	$65,621	$45,330
Cost of revenue	17,153	9,228
Gross profit	48,468	36,102
Operating expenses:
Research and development	23,134	14,898
Sales and marketing	56,495	47,440
General and administrative	15,472	11,546
Total operating expenses	95,101	73,884
Loss from operations	-46,633	-37,782
Remeasurement of redeemable convertible preferred stock warrant liability		-267
Interest expenses, net	-514	-405
Other income (expense), net	-77	7
Loss before provision for income taxes	-47,224	-38,447
Provision for income taxes	59	64
Net loss	-47,283	-38,511
Accretion of redeemable convertible preferred stock		-43
Net loss attributable to common stockholders	($47,283)	($38,554)
Net loss per common share attributable to common stockholders, basic and diluted	($0.40)	($2.81)
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted	119,379	13,734

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Apr. 30, 2015		Apr. 30, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net loss	($47,283)		($38,511)
Other comprehensive income (loss)*:
Changes in foreign currency translation adjustment	-7	[1]	2	[1]
Net change in unrealized gains on available-for-sale investments	2
Other comprehensive income (loss)	-5		2
Comprehensive loss	($47,288)		($38,509)
[1]	Tax effect was not material

CONDENSED_CONSOLIDATED_STATEME2

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Apr. 30, 2015	Apr. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	($47,283)	($38,511)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	9,166	5,896
Stock-based compensation expense	12,715	5,752
Amortization of deferred commissions	3,606	2,858
Remeasurement of redeemable convertible preferred stock warrant liability		267
Other	-2	157
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	15,623	10,586
Deferred commissions	-2,813	-2,789
Prepaid expenses, restricted cash and other assets	-28,455	-2,283
Accounts payable	266	1,314
Accrued expenses and other liabilities	-997	-6,288
Deferred rent	1,848	695
Deferred revenue	4,144	-1,122
Net cash used in operating activities	-32,182	-23,468
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of marketable securities	-106,319
Sales of marketable securities	3,140
Purchases of property and equipment	-9,901	-5,961
Acquisitions and purchases of intangible assets, net of cash acquired	-200
Net cash used in investing activities	-113,280	-5,961
CASH FLOWS FROM FINANCING ACTIVITIES:
Payment of initial public offering costs	-1,333	-1,735
Proceeds from exercise of stock options, net of repurchases of early exercised stock options	796	1,577
Employee payroll taxes paid related to net share settlement of restricted stock units	-4,215
Payments of capital lease obligations	-228
Net cash used in financing activities	-4,980	-158
Effect of exchange rate changes on cash and cash equivalents	-7	2
Net decrease in cash and cash equivalents	-150,449	-29,585
Cash and cash equivalents, beginning of period	330,436	108,851
Cash and cash equivalents, end of period	179,987	79,266
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for interest	359	206
Cash paid for income taxes	458	124
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Change in accrued equipment purchases	-2,798	9,533
Purchases of property and equipment under capital lease	1,730
Issuance of common stock in connection with acquisitions and purchases of intangible assets	664
Vesting of early exercised stock options and restricted stock	40	240
Change in unpaid deferred offering costs	($1,333)	($411)

Description_of_Business_and_Ba

Description of Business and Basis of Presentation	3 Months Ended
	Apr. 30, 2015
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Description of Business and Basis of Presentation	Note 1. Description of Business and Basis of Presentation
	Description of Business
	We were incorporated in the state of Washington in April 2005, and were reincorporated in the state of Delaware in March 2008. We officially changed our name from Box.Net, Inc. to Box, Inc. in November 2011. We provide a cloud-based mobile optimized Enterprise Content Collaboration platform that enables organizations of all sizes to easily and securely manage their content from anywhere, and collaborate internally and externally.
	Basis of Presentation
	The accompanying condensed consolidated balance sheet as of April 30, 2015 and the condensed consolidated statements of operations, the condensed consolidated statements of comprehensive loss and the condensed consolidated statements of cash flows for the three months ended April 30, 2015 and 2014, respectively, are unaudited. The condensed consolidated balance sheet data as of January 31, 2015 was derived from the audited consolidated financial statements that are included in our Form 10-K for the fiscal year ended January 31, 2015, which was filed with the Securities and Exchange Commission (the “SEC”) on March 30, 2015. The accompanying statements should be read in conjunction with the audited consolidated financial statements and related notes contained in our fiscal 2015 Form 10-K.
	The accompanying condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) for interim financial information. Accordingly, they do not include all of the financial information and footnotes required by U.S. GAAP for complete financial statements. In the opinion of our management, the unaudited condensed consolidated financial statements have been prepared on the same basis as the audited consolidated financial statements in the Form 10-K, and include all adjustments necessary for the fair presentation of our balance sheet as of April 30, 2015, and our results of operations, including our comprehensive loss, and our cash flows for the three months ended April 30, 2015 and 2014. All adjustments are of a normal recurring nature. The results for the three months ended April 30, 2015 are not necessarily indicative of the results to be expected for any subsequent quarter or for the fiscal year ending January 31, 2016.
	Prior Period Reclassifications
	Certain reclassifications of prior period amounts have been made to conform to the current period presentation.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	3 Months Ended
	Apr. 30, 2015
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 2. Summary of Significant Accounting Policies
	Use of Estimates
	The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make, on an ongoing basis, estimates and assumptions that affect the amounts reported and disclosed in the financial statements and the accompanying notes. Actual results could differ from these estimates. Such estimates include, but are not limited to, the determination of the allowance for accounts receivable, fair value of acquired intangible assets and goodwill, useful lives of acquired intangible assets and property and equipment, best estimate of selling price included in multiple-deliverable revenue arrangements, fair values of stock-based awards, legal contingencies, and the provision for income taxes, including related reserves, among others. Management bases its estimates on historical experience and on various other assumptions which management believes to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities.
	Revenue Recognition
	We derive our revenue from three sources: (1) subscription revenue, which is comprised of subscription fees from customers utilizing our cloud-based Enterprise Content Collaboration services, which include routine customer support, and Box Enterprise Key Management (EKM); (2) revenue from customers purchasing our premier support package; and (3) revenue from professional services such as implementing best practice use cases, project management and implementation consulting services.
	We recognize revenue when all of the following conditions are met:
	·	there is persuasive evidence of an arrangement;
	·	the service has been provided to the customer;
	·	the collection of fees is reasonably assured; and
	·	the amount of fees to be paid by the customer is fixed or determinable.
	We typically invoice our customers at the beginning of the term, in multiyear, annual, quarterly or monthly installments. Our subscription and support contracts are typically non-cancellable and do not contain refund-type provisions.
	In instances where we collect fees in advance of service delivery, revenue under the contract is deferred until we successfully deliver such services.
	Subscription revenue is recognized ratably over the period of the subscription beginning once all requirements for revenue recognition have been met, including provisioning the service so that it is available to our customers. Premier support is sold together with the subscription services, and the term of the premier support is generally the same as the related subscription services arrangement. Accordingly, we recognize premier support revenue in the same manner as the associated subscription hosting service. Professional services revenue is recognized as the services are rendered for time and material contracts, and using the proportional performance method over the period the services are performed for fixed price contracts. Professional services and premier support services revenues were not material for all periods presented.
	We assess collectability based on a number of factors, such as past collection history and creditworthiness of the customer. If management determines collectability is not reasonably assured, we defer revenue recognition until collectability becomes reasonably assured.
	Our arrangements can include multiple elements which may consist of some or all of subscription services, premier support and professional services. When multiple-element arrangements exist, we evaluate whether these individual deliverables should be accounted for as separate units of accounting or one single unit of accounting.
	In order to treat deliverables in a multiple-element arrangement as separate units of accounting, the delivered item or items must have standalone value upon delivery. A delivered item has standalone value to the customer when either (1) any vendor sells that item separately or (2) the customer could resell that item on a standalone basis. Our subscription services have standalone value as such services are often sold separately. Our premier support services do not have standalone value because we and other vendors do not sell premier support services separately. Our professional services have standalone value because there are other vendors which sell the same professional services separately. For new services, we assess standalone value consistently with the foregoing policy. Accordingly, we consider the separate units of accounting in our multiple deliverable arrangements to be the professional services, subscription services or a combined deliverable comprised of subscription services and premier support services. When multiple deliverables included in an arrangement are separable into different units of accounting, the arrangement consideration is allocated to the identified separate units of accounting based on their relative selling price. Multiple-element arrangement accounting guidance provides a hierarchy to use when determining the relative selling price for each unit of accounting. Vendor-specific objective evidence (VSOE) of selling price, based on the price at which the item is regularly sold by the vendor on a standalone basis, should be used if it exists. If VSOE of selling price is not available, third-party evidence (TPE) of selling price is used to establish the selling price if it exists. We have not established VSOE for our subscription services, premier support or professional services due to lack of pricing consistency, the introduction of new services and other factors. We have also concluded that third-party evidence of selling price is not a practical alternative due to differences in our service offerings compared to other parties and the availability of relevant third-party pricing information. Accordingly, we use our best estimate of selling price (BESP) to determine the relative selling price for our subscription, premier support and professional services offerings. For arrangements with multiple deliverables which can be separated into different units of accounting, we allocate the arrangement fee to the separate units of accounting based on our BESP. The amount of arrangement fee allocated is limited by contingent revenue, if any.
	We determined BESP by considering our overall pricing objectives and market conditions. Significant pricing practices taken into consideration for our subscription services, which may also include premier support, and professional services, include discounting practices, the size and volume of our transactions, the customer demographic, the geographic area where services are sold, price lists, our go-to-market strategy, historical standalone sales and contract prices. The determination of BESP is made through consultation with and approval by our management, taking into consideration the go-to-market strategy. As our go-to-market strategies evolve, we may modify our pricing practices in the future, which could result in changes in relative selling prices.
	Certain Risks and Concentrations
	Our financial instruments that are exposed to concentrations of credit risk consist primarily of cash and cash equivalents, marketable securities, restricted cash and accounts receivable. Although we deposit our cash with multiple financial institutions, our deposits, at times, may exceed federally insured limits.
	We sell to a broad range of customers. Our revenue is derived substantially from the U.S. across a multitude of industries. Accounts receivable are derived from the delivery of our services to customers primarily located in the U.S. We accept and settle our accounts receivable using credit cards, electronic payments and checks. A majority of our lower dollar value invoices are settled by credit card on or near the date of the invoice. We do not require collateral from customers to secure accounts receivable. We maintain an allowance for accounts receivable based upon the expected collectability, which takes into consideration specific customer creditworthiness and current economic trends. We believe collections of our accounts receivable are reasonably assured based on the size, industry diversification, financial condition and past transaction history of our customers. As of April 30, 2015, we had one reseller who accounted for 14% of total accounts receivable. As of January 31, 2015, no single customer accounted for more than 10% of total accounts receivable. No single customer represented over 10% of revenue during the three months ended April 30, 2015 and 2014.
	We serve our customers and users from datacenter facilities operated by third parties. In order to reduce the risk of down time of our enterprise cloud content management services, we have established datacenters in various locations in the United States. We have internal procedures to restore services in the event of disaster at one of our current datacenter facilities. Even with these procedures for disaster recovery in place, our cloud services could be significantly interrupted during the implementation of the procedures to restore services.
	Geographic Locations
	For the three months ended April 30, 2015 and 2014, revenue attributed to the United States was approximately 80%, and no other country outside of the United States comprised 10% or greater of our revenue.
	Substantially all of our net assets are located in the United States. As of April 30, 2015 and January 31, 2015, property and equipment located in the United States was approximately 98%.
	Foreign Currency Translation and Transactions
	The functional currency of our principal foreign subsidiaries is generally the U.S. dollar. Adjustments resulting from translating foreign functional currency financial statements into U.S. dollars for those entities that do not have U.S. dollars as their functional currency are recorded as part of a separate component of the consolidated statements of comprehensive loss. Foreign currency transaction gains and losses are included in the consolidated statements of operations for the period. All assets and liabilities denominated in a foreign currency are translated into U.S. dollars at the exchange rate on the balance sheet date. Revenue and expenses are translated at the average exchange rate during the period. Equity transactions are translated using historical exchange rates. Translation adjustments at the balance sheet dates were not material. Transaction gains and losses recognized were not material for all periods presented.
	Foreign Currency Translation and Transactions
	The functional currency of our principal foreign subsidiaries is generally the U.S. dollar. Adjustments resulting from translating foreign functional currency financial statements into U.S. dollars for those entities that do not have U.S. dollars as their functional currency are recorded as part of a separate component of the consolidated statements of comprehensive loss. Foreign currency transaction gains and losses are included in the consolidated statements of operations for the period. All assets and liabilities denominated in a foreign currency are translated into U.S. dollars at the exchange rate on the balance sheet date. Revenue and expenses are translated at the average exchange rate during the period. Equity transactions are translated using historical exchange rates. Translation adjustments at the balance sheet dates were not material. Transaction gains and losses recognized were not material for all periods presented.
	Restricted Cash
	Restricted cash is comprised of certificates of deposit and money market funds related to our credit card processing and leases.
	Marketable Securities
	Our marketable securities consisted of corporate paper, U.S. government agency obligations, corporate debt securities, asset-backed securities and U.S. government obligations. We classify our marketable securities as available-for-sale at the time of purchase and reevaluate such classification as of each balance sheet date. We may sell these securities at any time for use in current operations or for other purposes, such as consideration for acquisitions, even if they have not yet reached maturity. As a result, we classify our investments, including securities with maturities beyond twelve months as current assets in the accompanying consolidated balance sheets. All marketable securities are recorded at their estimated fair value. Unrealized gains and losses for available-for-sale securities are recorded in other comprehensive income (loss). We evaluate our investments to assess whether those with unrealized loss positions are other than temporarily impaired. We consider impairments to be other than temporary if they are related to deterioration in credit risk or if it is likely we will sell the securities before the recovery of their cost basis. Realized gains and losses and declines in value deemed to be other than temporary are determined based on the specific identification method and are reported in other income (expense), net in the consolidated statements of operations.
	Recent Accounting Pronouncement
	In May 2015, the FASB issued ASU 2015-07, Disclosures for Investments in Certain Entities That Calculate Net Asset Value Per Share (or Its Equivalent), which amends ASC 820, Fair Value Measurement. The standard removes the requirement to categorize within the fair value hierarchy investments for which fair value is measured using the net asset value per share practical expedient and removes certain related disclosure requirements. The standard will be effective for our fiscal year beginning February 1, 2016. We do not expect the standard to have a material impact on our consolidated financial statements.
	In May 2014, the FASB issued ASU 2014-09 regarding ASC Topic 606, Revenue from Contracts with Customers. The standard provides principles for recognizing revenue for the transfer of promised goods or services to customers with the consideration to which the entity expects to be entitled in exchange for those goods or services. The standard will be effective for our fiscal year beginning February 1, 2017. We are currently in the process of assessing the adoption methodology, which allows the amendment to be applied retrospectively to each prior period presented, or with the cumulative effect recognized as of the date of initial application. We are also evaluating the impact of the adoption of this standard on our consolidated financial statements and have not determined whether the effect will be material.

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Apr. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 3. Fair Value Measurements
	We define fair value as the exchange price that would be received from selling an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. We measure our financial assets and liabilities at fair value at each reporting period using a fair value hierarchy which requires us to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. A financial instrument’s classification within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. Three levels of inputs may be used to measure fair value:
	·	Level 1—Observable inputs are unadjusted quoted prices in active markets for identical assets or liabilities.
	·	Level 2—Observable inputs are quoted prices for similar assets and liabilities in active markets or inputs other than quoted prices which are observable for the assets or liabilities, either directly or indirectly through market corroboration, for substantially the full term of the financial instruments.
	·	Level 3—Unobservable inputs which are supported by little or no market activity and which are significant to the fair value of the assets or liabilities. These inputs are based on our own assumptions used to measure assets and liabilities at fair value and require significant management judgment or estimation.
	We measure our marketable securities and restricted cash at fair value on a recurring basis. We classify our marketable securities and restricted cash within Level 1 or Level 2 because they are valued using either quoted market prices for identical assets or inputs other than quoted prices which are directly or indirectly observable in the market, including readily-available pricing sources for the identical underlying security which may not be actively traded.
	The following tables set forth the fair value of our financial assets and liabilities measured at fair value on a recurring basis as of April 30, 2015 and January 31, 2015, using the above input categories (in thousands):
			30-Apr-15
			Level 1		Level 2		Level 3		Fair Value
	Assets
	Cash and cash equivalents:
	Corporate paper			—	$	21,695		—	$	21,695
	Marketable securities:
	Corporate paper			—		40,810		—		40,810
	U.S. government agency obligations			—		20,295		—		20,295
	Corporate debt securities			—		15,515		—		15,515
	Asset-backed securities			—		15,334		—		15,334
	U.S. government obligations			—		12,035		—		12,035
	Restricted cash:
	Certificates of deposit			—		27,165		—		27,165
	Money market funds			1,202		—		—		1,202
	Total assets measured at fair value		$	1,202	$	152,849	$	—	$	154,051
			31-Jan-15
			Level 1		Level 2		Level 3		Fair Value
	Assets
	Restricted cash:
	Certificates of deposit		$	—	$	3,367	$	—	$	3,367
	Total assets measured at fair value		$	—	$	3,367	$	—	$	3,367

Marketable_Securities

Marketable Securities	3 Months Ended
	Apr. 30, 2015
Investments Debt And Equity Securities [Abstract]
Marketable Securities	Note 4. Marketable Securities
	We held no cash equivalents and marketable securities as of January 31, 2015. The following is a summary of our cash equivalents and marketable securities as of April 30, 2015 (in thousands).
		30-Apr-15
		Amortized		Unrealized		Unrealized			Estimated
		Cost		Gain		Loss			Fair Value
	Corporate paper	$	62,496	$	10	$	(1	)	$	62,505
	U.S. government agency obligations		20,295		1		(1	)		20,295
	Corporate debt securities		15,518		4		(7	)		15,515
	Asset-backed securities		15,335		1		(2	)		15,334
	U.S. government obligations		12,037		—		(2	)		12,035
		$	125,681	$	16	$	(13	)	$	125,684
	Included in cash and cash equivalents	$	21,692	$	3	$	—		$	21,695
	Included in marketable investments	$	103,989	$	13	$	(13	)	$	103,989
	None of our marketable securities had been in an unrealized loss position for greater than 12 months as of April 30, 2015. Based on our evaluation of available evidence we concluded that the gross unrealized losses on our marketable securities as of April 30, 2015, are temporary in nature.
	The amortized cost and estimated fair value of our cash equivalents and marketable securities as of April 30, 2015 are shown below by contractual maturity (in thousands).
		30-Apr-15
		Amortized		Estimated
		Cost		Fair Value
	Less than one year	$	112,196	$	112,200
	Due in one to five years		13,485		13,484
		$	125,681	$	125,684
	Net realized gains and losses from sales of our available-for-sale securities for the three months ended April 30, 2015 were not significant.

Balance_Sheet_Components

Balance Sheet Components	3 Months Ended
	Apr. 30, 2015
Balance Sheet Components [Abstract]
Balance Sheet Components	Note 5. Balance Sheet Components
	Prepaid Expenses and Other Current Assets
	Prepaid expenses and other current assets consisted of the following (in thousands):
		April 30,			January 31,
		2015			2015
	Tenant incentives receivable under our new headquarters	$	23,395		$	—
	lease in Redwood City (see Note 8)
	Other		15,861			12,132
	Total prepaid expenses and other current assets	$	39,256		$	12,132
	Property and Equipment, Net
	Property and equipment, net consisted of the following (in thousands):
		April 30,			January 31,
		2015			2015
	Servers	$	86,857		$	81,068
	Leasehold improvements		13,899			13,400
	Computer hardware and software		9,105			8,724
	Furniture and fixtures		5,334			5,046
	Construction in progress		6,691			4,815
	Total property and equipment		121,886			113,053
	Less: accumulated depreciation		(62,627	)		(54,607	)
	Total property and equipment, net	$	59,259		$	58,446
	As of April 30, 2015, the gross carrying amount of property and equipment includes $2.4 million of servers and $1.3 million of construction in progress acquired under capital leases, and the accumulated depreciation of property and equipment acquired under these capital leases was $355,000. As of January 31, 2015, the gross carrying amount of property and equipment includes $1.9 million of servers and $69,000 of construction in progress acquired under capital leases, and the accumulated depreciation of property and equipment acquired under these capital leases was $140,000.
	Depreciation expense related to property and equipment was $8.0 million and $5.2 million for the three months ended April 30, 2015 and 2014, respectively. Included in these amounts was depreciation expense for servers acquired under capital leases in the amount of $214,000 and $0, respectively. Construction in progress primarily consists of servers, networking equipment and storage infrastructure being provisioned in our third party datacenter hosting facilities as well as leasehold improvements. In addition, the amounts of interest capitalized to property and equipment were $6,000 and 89,000 for the three months ended April 30, 2015 and 2014, respectively.

Acquisitions

Acquisitions	3 Months Ended
	Apr. 30, 2015
Business Combinations [Abstract]
Acquisitions	Note 6. Acquisitions
	During the three months ended April 30, 2015, we acquired two companies for an aggregate purchase price of $764,000. We accounted for these transactions as business combinations. In allocating the purchase consideration based on estimated fair values, we recorded $349,000 of developed technology and $415,000 of goodwill. Goodwill for these acquisitions is deductible for U.S. income tax purposes. Developed technology is being amortized on a straight-line basis over an estimated useful life of two years. These acquisitions are expected to enhance our Box service by leveraging the acquired companies’ technologies, along with gaining access to their key talent. Aggregate transaction costs related to these acquisitions were immaterial.
	Results of operations for these acquisition have been included in our consolidated statements of operations since the acquisition dates and were not material. Pro forma results of operations for these acquisitions have not been presented because they were also not material to the consolidated results of operations.

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	3 Months Ended
	Apr. 30, 2015
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Note 7. Goodwill and Intangible Assets
	Goodwill activity is reflected in the following table (in thousands):
	Balance as of January 31, 2015	$	11,242
	Goodwill acquired		415
	Balance as of April 30, 2015	$	11,657
	Intangible assets consisted of the following (in thousands):
		Weighted			Gross Value		Accumulated			Net Carrying
		Average Useful					Amortization			Value
		Life (1)
	30-Apr-15
	Developed technology		2.6	years	$	11,473	$	(6,375	)	$	5,098
	Trade name and other		6.9	years		1,201		(753	)		448
	Intangibles, net				$	12,674	$	(7,128	)	$	5,546
	31-Jan-15
	Developed technology		2.7	years	$	11,124	$	(5,268	)	$	5,856
	Trade name and other		6.9	years		1,201		(714	)		487
	Intangibles, net				$	12,325	$	(5,982	)	$	6,343
	-1	From the date of acquisition
	Intangible amortization expense was $1.1 million and $695,000 for the three months ended April 30, 2015 and 2014, respectively. Amortization of acquired technology is included in cost of revenue and amortization for trade names is included in general and administrative expenses in the consolidated statements of operations. As of April 30, 2015, expected amortization expense for intangible assets was as follows (in thousands):
	Years ending January 31:
	Remainder of 2016	$	3,401
	2017		1,952
	2018		169
	2019		23
	2020		1
		$	5,546

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Apr. 30, 2015
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 8. Commitments and Contingencies
	Letters of Credit
	As of April 30, 2015 and January 31, 2015, we had letters of credit in the amount of $27.0 million in connection with our facility leases. These letters of credit mature at various dates through December 1, 2018. As of April 30, 2015 and January 31, 2015, certain letters of credit are collateralized by certificates of deposit held by us in the amount of $27.0 million and $2.0 million, respectively. Refer to Note 9 for additional details.
	Leases
	We have entered into various non-cancellable operating lease agreements for certain of our offices and datacenters with lease periods expiring primarily between fiscal years 2016 and 2029. Certain of these arrangements have free or escalating rent payment provisions and optional renewal clauses. We are also committed to pay a portion of the actual operating expenses under certain of these lease agreements. These operating expenses are not included in the table below.
	We also entered into various capital lease arrangements to obtain servers for our operations. These agreements are typically for three years. The leases are secured by the underlying leased servers.
	As of April 30, 2015, future minimum lease payments under non-cancellable capital and operating leases are as follows (in thousands):
	Years ending January 31:	Capital			Operating
		Leases			Leases
	Remainder of 2016	$	951		$	4,142
	2017		1,267			12,191
	2018		1,190			17,857
	2019		66			19,478
	2020		—			22,172
	Thereafter		—			190,660
	Total minimum lease payments	$	3,474		$	266,500
	Less: amount representing interest		(163	)
	Present value of minimum lease payments	$	3,311
	In March and April 2015, we signed subleases for three floors of our new headquarters. The 18 and 36-month subleases expire in fiscal 2018 and 2019, and non-cancellable sublease proceeds of $12.6 million are included in the table above. In addition, because our subtenants will occupy the subleased portions of our new headquarters prior to the related lease commencement date, we will incur contingent rent payments of $5.5 million, which are also included in the table above.
	We recognize rent expense under our operating leases on a straight-line basis. Rent expense totaled $3.7 million and $1.4 million, net of sublease income of $246,000 and $437,000 for the three months ended April 30, 2015 and 2014, respectively.
	We establish assets and liabilities for the present value of estimated future costs to return certain of our leased facilities to their original condition. Such assets are depreciated over the lease period into operating expense, and the recorded liabilities are accreted to the future value of the estimated restoration costs. As of April 30, 2015 and January 31, 2015, we had such asset retirement obligations in the amount of $138,000 and $135,000, respectively, which are included in other noncurrent liabilities in the consolidated balance sheets.
	Purchase Obligations
	As of April 30, 2015, future payments under non-cancellable contractual purchases, which relate primarily to datacenter operations and marketing activities, are as follows (in thousands):
	Years ending January 31:
	Remainder of 2016	$	14,922
	2017		11,244
	2018		3,083
		$	29,249
	Legal Matters
	On June 5, 2013, Open Text S.A. (Open Text) filed a lawsuit against us in the U.S. District Court, Eastern District of Virginia, alleging that our core cloud software and Box Edit application infringe 12 patents of Open Text. Open Text sought preliminary and permanent injunctions against infringement, treble damages, and attorneys’ fees. This case was subsequently transferred to the U.S. District Court for the Northern District of California.
	On September 13, 2013, Open Text filed a motion for preliminary injunction seeking to enjoin us from providing our Box Edit feature to companies with more than 100 users. On April 9, 2014, the California court denied Open Text’s motion for preliminary injunction, finding that (1) Open Text failed to meet its burden to show irreparable harm, (2) Open Text failed to show a reasonable likelihood of success on the merits of its case, and (3) we have raised a substantial question as to the validity of the patents asserted during the preliminary injunction proceedings.
	On September 19, 2014, in a related action, Open Text S.A. v. Alfresco Software Ltd., et al., Case No. 13-cv-04843-JD, the Court granted the Alfresco Defendants’ motion to dismiss with prejudice the asserted claims of the Dialog Patents, finding the asserted claims of the Dialog Patents patent ineligible under 35 U.S.C. § 101. On January 20, 2015, the Court entered an Order granting our motion for judgment on the pleadings as to the asserted patent claims of the Groupware Patents. The Court found that the asserted patent claims of the Groupware Patents are invalid because they claim non-patentable subject matter. As a result of the Court’s January 20, 2015 order and other pretrial orders, the lawsuit was narrowed to four total claims across the three remaining File Synchronization Patents accusing the Company’s Box Edit feature and Box Android application.
	Trial commenced on February 2, 2015. On February 13, 2015, the jury returned a verdict, finding the asserted claims of the File Synchronization patents infringed and were not invalid. The jury awarded damages in favor of Open Text in a lump sum and fully paid-up royalty in the amount of $4.9 million. The Court found no willful infringement of the asserted claims and foreclosed Open Text’s request for a permanent injunction since the jury returned a lump-sum award. On February 19, 2015, Open Text filed a notice of appeal to the United States Court of Appeals for the Federal Circuit from the Court’s Order granting our motion for judgment of invalidity of the Groupware Patents. On March 9, 2015, Open Text filed a first amended notice of appeal from additional orders by the Court.
	While we intend to continue to defend the lawsuit vigorously and continue to believe we have valid defense to Open Text’s claims, we considered the issuance of the verdict a recognized subsequent event that provided additional evidence about conditions that existed as of January 31, 2015. Accordingly, we accrued a liability in the amount of $4.9 million for the settlement payment as of January 31, 2015, and recorded an expense in the amount of $3.9 million for the year ended January 31, 2015, in relation to the portion of the settlement amount attributable to prior periods. The portion of the settlement amount attributable to future periods is recorded as an asset as of January 31, 2015. This asset is being amortized over an estimated useful life of 14 months, and the amortization expense was $186,000 for the three months ended April 30, 2015.
	In addition to the litigation discussed above, from time to time, we are a party to litigation and subject to claims that arise in the ordinary course of business. We investigate these claims as they arise, and accrue estimates for resolution of litigation and other contingencies when losses are probable and estimable. Although the results of litigation and claims cannot be predicted with certainty, we believe there was not at least a reasonable possibility that we had incurred a material loss with respect to such loss contingencies as of April 30, 2015 for which a reserve was not already established.
	Indemnification
	We include service level commitments to our customers warranting certain levels of uptime reliability and performance and permitting those customers to receive credits in the event that we fail to meet those levels. In addition, our customer contracts often include (i) specific obligations that we maintain the availability of the customer’s data through our service and that we secure customer content against unauthorized access or loss, and (ii) indemnity provisions whereby we indemnify our customers for third-party claims asserted against them that result from our failure to maintain the availability of their content or securing the same from unauthorized access or loss. To date, we have not incurred any material costs as a result of such commitments.
	Our arrangements generally include certain provisions for indemnifying customers against liabilities if our products or services infringe a third party’s intellectual property rights. It is not possible to determine the maximum potential amount under these indemnification obligations due to the limited history of prior indemnification claims and the unique facts and circumstances involved in each particular agreement. To date, we have not incurred any material costs as a result of such obligations and have not accrued any liabilities related to such obligations in the consolidated financial statements. In addition, we indemnify our officers, directors and certain key employees while they are serving in good faith in their respective capacities. To date, there have been no claims under any indemnification provisions.

Debt

Debt	3 Months Ended
	Apr. 30, 2015
Debt Disclosure [Abstract]
Debt	Note 9. Debt
	Line of Credit
	In August 2013, we entered into a two-year $100.0 million secured revolving credit facility. The credit facility is denominated in U.S. dollars and, depending on certain conditions, each borrowing is subject to a floating interest rate equal to the London Interbank Offer Rate (LIBOR) plus 3.0% or the Alternate Base Rate (ABR) plus 2.0%. In addition, there is a commitment fee of 0.5% on outstanding unused commitment amount. At closing, we drew $34.0 million at 3.4% (six month LIBOR plus 3.0%) which we used to repay previous loans, as well as for other general corporate purposes. In July 2014, we drew an additional $12.0 million under the credit facility at 3.3% (six month LIBOR plus 3.0%). In September 2014, we paid down $6.0 million and amended the credit facility to reduce our borrowing capacity from $100.0 million to $75.0 million and extend the facility through August 2016. Concurrently and in conjunction with the execution of our new headquarters lease in September 2014, letters of credit in the aggregate amount of $25.0 million were issued under the credit facility. These letters of credit were subject to interest at 3.25% per annum.
	In March 2015, we amended the credit facility to reduce our borrowing capacity to $60.0 million as of April 2015, and to increase certain limitations on the amount of capital asset and real estate related obligations we may incur. In connection with this amendment, the letters of credit under the credit facility were cancelled, and a new letter of credit in the amount of $25.0 million was issued by a party not affiliated with the line of credit, which was secured by a certificate of deposit in the same amount. As of April 30, 2015, the outstanding borrowings under the credit facility were $40.0 million, and our remaining borrowing capacity under the credit facility was $20.0 million.
	Borrowings under the credit facility are collateralized by substantially all of our assets. The credit facility also contains various covenants, including covenants related to the delivery of financial and other information, the maintenance of quarterly financial covenants, material adverse effects, as well as limitations on dispositions, mergers or consolidations and other corporate activities. As of April 30, 2015, we were in compliance with all financial covenants.
	In connection with the credit facility, we incurred interest expense of $620,000 and $523,000 during the three months ended April 30, 2015 and 2014, respectively. During the same periods, we capitalized $6,000 and $89,000 of interest costs. Interest expense also includes amortization of issuance costs, unused commitment fees and fees on letters of credit which are recognized over the related term of the borrowing.

StockBased_Compensation

Stock-Based Compensation	3 Months Ended
	Apr. 30, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	Note 10. Stock-Based Compensation
	2015 Equity Incentive Plan
	In January 2015, our board of directors adopted the 2015 Equity Incentive Plan (2015 Plan), which became effective prior to the completion of our initial public offering (IPO). A total of 12,200,000 shares of Class A common stock was initially reserved for issuance pursuant to future awards under the 2015 Plan. Additionally, any shares subject to outstanding awards under our 2006 Equity Incentive Plan (2006 Plan) or 2011 Equity Incentive Plan (2011 Plan) that are cancelled or repurchased subsequent to the 2015 Plan’s effective date will be returned to the pool of shares reserved for issuance under the 2015 Plan. Awards granted under the 2015 Plan may be (i) incentive stock options, (ii) nonstatutory stock options, (iii) restricted stock units, (iv) restricted stock awards or (v) stock appreciation rights, as determined by our board of directors at the time of grant. Options and restricted stock units generally vest 25% one year from the vesting commencement date and (a) in the case of options, 1/48th per month thereafter, and (b) in the case of restricted stock units, 1/16th per quarter thereafter.  As of April 30, 2015, 16,331,626 shares were reserved for future issuance under the 2015 Plan.
	2015 Employee Stock Purchase Plan
	In January 2015, our board of directors adopted the 2015 Employee Stock Purchase Plan, which became effective prior to the completion of our IPO. A total of 2,500,000 shares of Class A common stock was initially reserved for issuance under the 2015 ESPP. The 2015 ESPP allows eligible employees to purchase shares of our Class A common stock at a discount through payroll deductions of up to 15% of their eligible compensation, subject to any plan limitations. Except for the initial offering period, the 2015 ESPP provides for 24-month offering periods beginning March 16 and September 16 of each year, and each offering period will consist of four six-month purchase periods. The initial offering period began January 23, 2015, and will end on March 15, 2017.
	On each purchase date, eligible employees will purchase our stock at a price per share equal to 85% of the lesser of (1) the fair market value of our stock on the offering date or (2) the fair market value of our stock on the purchase date. As of April 30, 2015, 3,696,550 shares were reserved for future issuance under the 2015 ESPP.
	Early Exercises of Stock Options
	Prior to our IPO, certain employees and directors exercised stock options prior to vesting with the approval of our board of directors. The unvested shares are subject to a repurchase right held by us at the original purchase price. Early exercises of options are not deemed to be substantive exercises for accounting purposes, and accordingly, amounts received for early exercises are initially recorded in other liabilities and are reclassified to common stock and additional paid-in capital as the underlying shares vest. As of April 30, 2015 and January 31, 2015, we had $98,000 and $286,000, respectively, in liabilities and 67,499 and 113,541 unvested shares subject to repurchase related to early exercises of stock options.
	Stock Options
	The following table summarizes the stock option activity under the equity incentive plans and related information:
		Shares Subject to Options Outstanding						Weighted-Average
		Shares Subject to				Weighted-		Remaining
		Outstanding				Average Exercise		Contractual Life				Aggregate
		Options				Price		(Years)				Intrinsic Value
												(in thousands)
	Balance as of January 31, 2015		17,465,571			$	5.67		7.8			$	229,713
	Options granted		342,980				17.54
	Option exercised		(350,096	)			3.09
	Options forfeited/cancelled		(563,225	)			6.92
	Balance as of April 30, 2015		16,895,230			$	5.92		7.6			$	190,236
	Vested and expected to vest as of April 30, 2015		16,628,973			$	5.85		7.58			$	188,405
	Exercisable as of April 30, 2015		8,924,686			$	3.5		6.98			$	121,735
	The aggregate intrinsic value of options vested and expected to vest and exercisable as of April 30, 2015 is calculated based on the difference between the exercise price and the current fair value of our common stock. The aggregate intrinsic value of exercised options for the three months ended April 30, 2015 and 2014 was $5.3 million and $11.0 million, respectively.  The aggregate estimated fair value of stock options granted to employees that vested during the three months ended April 30, 2015 and 2014 was $6.1 million and $4.4 million, respectively.  The weighted-average grant date fair value of options granted to employees during the three months ended April 30, 2015 and 2014 was $7.70 and $8.66 per share, respectively.
	As of April 30, 2015, there was $34.7 million of unrecognized stock-based compensation expense related to outstanding stock options granted to employees that is expected to be recognized over a weighted-average period of 2.65 years.
	Restricted Stock Units
	The following table summarizes the restricted stock unit activity under the equity incentive plans and related information:
		Number of				Weighted-
		Restricted				Average
		Stock Units				Grant Date
		Outstanding				Fair Value
	Unvested balance - January 31, 2015		4,939,709			$	15.66
	Granted		2,673,044				17.54
	Vested, net of shares withheld for employee payroll taxes		(348,962	)			17.77
	Forfeited/cancelled, including shares withheld for employee payroll taxes		(430,831	)			17.17
	Unvested balance - April 30, 2015		6,832,960			$	16.19
	As of April 30, 2015, there was $101.1 million of unrecognized stock-based compensation expense related to outstanding restricted stock units granted to employees that is expected to be recognized over a weighted-average period of 3.47 years.
	Restricted Stock
	The following table summarizes the restricted stock activity under the equity incentive plans and related information:
		Number of				Weighted-
		Restricted				Average
		Stock				Grant Date
		Outstanding				Fair Value
	Unvested balance - January 31, 2015		172,661			$	9.6
	Granted		23,364				17.54
	Vested		(21,516	)			14.99
	Forfeited/cancelled, including shares withheld for employee payroll taxes		(7,790	)			17.54
	Unvested balance - April 30, 2015		166,719			$	9.65
	In addition, in connection with our fiscal 2016 acquisitions, we issued 2,500 shares of restricted stock with a weighted-average grant date fair value of $17.54 per share during the three months ended April 30, 2015. This restricted stock was separately authorized by our board of directors, and did not reduce the number of shares available for future issuance under the 2015 Plan. All of these shares were still outstanding as of April 30, 2015.
	As of April 30, 2015, there was $4.0 million of unrecognized stock-based compensation expense related to outstanding restricted stock granted to employees that is expected to be recognized over a weighted-average period of 2.19 years.
	2015 ESPP and Other
	As of April 30, 2015, there was $13.4 million of unrecognized stock-based compensation expense related to our 2015 ESPP that is expected to be recognized over the remaining term of the respective offering periods.
	As of April 30, 2015, there was $1.4 million of unrecognized stock-based compensation related to 163,619 shares of contingently issuable common stock for certain bonus awards given in connection with our fiscal 2016 and 2015 acquisitions that is expected to be recognized over a weighted-average period of 2.14 years.
	Stock-Based Compensation
	The following table summarizes the components of stock-based compensation expense recognized in the consolidated statements of operations (in thousands):
		Three Months Ended
		April 30,
		2015				2014
	Cost of revenue	$	851			$	226
	Research and development		5,263				2,008
	Sales and marketing		4,283				2,065
	General and administrative		2,318				1,453
	Net loss attributable to common stockholders	$	12,715			$	5,752
	Determination of Fair Value
	We estimated the fair value of employee stock options and ESPP purchase rights using a Black-Scholes option pricing model with the following assumptions:
	Three Months Ended
	April 30,
	2015						2014
Employee Stock Options
Expected term (in years)		6		-		6.1	5.7	-	6.1
Risk-free interest rate		1.6	%	-		1.70%				2.10%
Volatility		43	%	-		44%				49%
Dividend yield						0%			0%
Employee Stock Purchase Plan
Expected term (in years)	0.5			-		2				—
Risk-free interest rate		0.2	%	-		0.70%				—
Volatility		39	%	-		41%				—
Dividend yield						0%				—
The assumptions used in the Black-Scholes option pricing model were determined as follows:
Fair Value of Common Stock. Prior to our IPO in January 2015, our board of directors considered numerous objective and subjective factors to determine the fair value of our common stock at each grant date. These factors included, but were not limited to, (i) contemporaneous valuations of common stock performed by unrelated third-party specialists; (ii) the prices for our redeemable convertible preferred stock sold to outside investors; (iii) the rights, preferences and privileges of our redeemable convertible preferred stock relative to our common stock; (iv) the lack of marketability of our common stock; (v) developments in the business; and (vi) the likelihood of achieving a liquidity event, such as an IPO or a merger or acquisition, given prevailing market conditions.
Subsequent to the completion of our IPO, we use the market closing price for our Class A common stock as reported on the New York Stock Exchange.
Expected Term. The expected term represents the period that our share-based awards are expected to be outstanding. The expected term assumptions were determined based on the vesting terms, exercise terms and contractual lives of the options and ESPP purchase rights.
Expected Volatility. Since we do not have sufficient trading history of our common stock, the expected volatility was derived from the historical stock volatilities of several unrelated public companies within the same industry that we consider to be comparable to our business over a period equivalent to the expected term of the stock option grants and ESPP purchase rights.
Risk-free Interest Rate. The risk-free rate that we use is based on U.S. Treasury zero-coupon issues with remaining terms similar to the expected term on the options.
Dividend Yield. We have never declared or paid any cash dividends and do not plan to pay cash dividends in the foreseeable future, and, therefore, use an expected dividend yield of zero.

Net_Loss_Per_Share_Attributabl

Net Loss Per Share Attributable to Common Stockholders	3 Months Ended
	Apr. 30, 2015
Earnings Per Share [Abstract]
Net Loss per Share Attributable to Common Stockholders	Note 11. Net Loss per Share Attributable to Common Stockholders
	We calculate our basic and diluted net loss per share attributable to common stockholders in conformity with the two-class method required for companies with participating securities. We consider all series of our redeemable convertible preferred stock to be participating securities. In the event a dividend is declared or paid on our common stock, holders of redeemable convertible preferred stock are entitled to a proportionate share of such dividend in proportion to the holders of common stock on an as-if converted basis. Under the two-class method, basic net loss per share attributable to common stockholders is calculated by dividing the net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding for the period, less shares subject to repurchase. Net loss attributable to common stockholders is determined by allocating undistributed earnings between common and redeemable convertible preferred stockholders. The diluted net loss per share attributable to common stockholders is computed by giving effect to all potential dilutive common stock equivalents outstanding for the period. For purposes of this calculation, redeemable convertible preferred stock, options to purchase common stock, restricted stock units, employee stock purchase plan, warrants to purchase redeemable convertible preferred stock, repurchasable shares from early exercised options and unvested restricted stock, and contingently issuable common stock authorized in connection with certain acquisitions are considered common stock equivalents but have been excluded from the calculation of diluted net loss per share attributable to common stockholders as their effect is antidilutive. Under the two-class method, the net loss attributable to common stockholders is not allocated to the convertible redeemable preferred stock as the holders of our convertible redeemable preferred stock do not have a contractual obligation to share in our losses.
	The rights, including the liquidation and dividend rights, of the holders of our Class A and Class B common stock are identical, except with respect to voting. As the liquidation and dividend rights are identical, the undistributed earnings are allocated on a proportionate basis and the resulting net loss per share attributed to common stockholders will, therefore, be the same for both Class A and Class B common stock on an individual or combined basis. We did not present dilutive net loss per share on an if-converted basis because the impact was not dilutive.
	The following table sets forth the computation of basic and diluted net loss per share (in thousands, except per share amounts):
		Three Months Ended April 30,
		2015						2014
		Class A			Class B			Class A		Class B
	Numerator:
	Net loss	$	(6,031	)	$	(41,252	)	$	—	$	(38,511	)
	Add: accretion of redeemable convertible		—			—			—		(43	)
	preferred stock
	Net loss attributable to common stockholders	$	(6,031	)	$	(41,252	)	$	—	$	(38,554	)
	Denominator:
	Weighted-average number of shares outstanding—		15,226			104,153			—		13,734
	basic and diluted
	Net loss per share attributable to common	$	(0.40	)	$	(0.40	)	$	—	$	(2.81	)
	stockholders—basic and diluted
	The following weighted-average outstanding shares of common stock equivalents were excluded from the computation of diluted net loss per share attributable to common stockholders for the periods presented because the impact of including them would have been antidilutive (in thousands):
		Three Months Ended April 30,
		2015			2014
	Redeemable convertible preferred stock		—			76,238
	Options to purchase common stock		17,077			18,247
	Restricted stock units		5,663			1,070
	Employee stock purchase plan		3,263			—
	Warrants to purchase redeemable convertible		—			87
	preferred stock
	Repurchasable shares from early-exercised options		651			674
	and unvested restricted stock
	Contingently issuable common stock		161			—
			26,815			96,316

Income_Taxes

Income Taxes	3 Months Ended
	Apr. 30, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Note 12. Income Taxes
	Utilization of the net operating loss carryforwards and credits may be subject to substantial annual limitation due to the ownership change limitations provided by Section 382 of the Internal Revenue Code of 1986, as amended, and similar state provisions. The annual limitation may result in the expiration of net operating losses and credits before utilization.
	We evaluate tax positions for recognition using a more-likely-than-not recognition threshold, and those tax positions eligible for recognition are measured as the largest amount of tax benefit that is greater than 50% likely of being realized upon the effective settlement with a taxing authority that has full knowledge of all relevant information.
	We file tax returns in the United States for federal, California, and other states. All tax years remain open to examination for both federal and state purposes as a result of our net operating loss and credit carryforwards. We file foreign tax returns in the United Kingdom starting with the year ended January 31, 2013, and in France, Germany and Japan starting with the year ended January 31, 2014. These tax years remain open to examination.
	We believe that we have provided adequate reserves for our income tax uncertainties in all open tax years. We do not expect our gross unrecognized tax benefits to change significantly in the next 12 months.

Segments

Segments	3 Months Ended
	Apr. 30, 2015
Segment Reporting [Abstract]
Segments	Note 13. Segments
	Our chief operating decision maker reviews financial information presented on a consolidated basis for purposes of allocating resources and evaluating financial performance. As such, we have a single reporting segment and operating unit structure. Since we operate in one operating segment, all required segment information can be found in the consolidated financial statements.

Subsequent_Events

Subsequent Events	3 Months Ended
	Apr. 30, 2015
Subsequent Events [Abstract]
Subsequent Events	Note 14. Subsequent Events
	In May 2015, we acquired certain assets of, and hired certain employees from, Verold Inc., a privately-held technology company which has built a cloud-based 3D model viewer and editor, for an aggregate purchase price of $5.4 million (in our common stock). We are in the process of finalizing the purchase price allocation, including determining the fair value of the acquired intangibles.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Apr. 30, 2015
Accounting Policies [Abstract]
Use of Estimates	Use of Estimates
	The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make, on an ongoing basis, estimates and assumptions that affect the amounts reported and disclosed in the financial statements and the accompanying notes. Actual results could differ from these estimates. Such estimates include, but are not limited to, the determination of the allowance for accounts receivable, fair value of acquired intangible assets and goodwill, useful lives of acquired intangible assets and property and equipment, best estimate of selling price included in multiple-deliverable revenue arrangements, fair values of stock-based awards, legal contingencies, and the provision for income taxes, including related reserves, among others. Management bases its estimates on historical experience and on various other assumptions which management believes to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities.
Revenue Recognition	Revenue Recognition
	We derive our revenue from three sources: (1) subscription revenue, which is comprised of subscription fees from customers utilizing our cloud-based Enterprise Content Collaboration services, which include routine customer support, and Box Enterprise Key Management (EKM); (2) revenue from customers purchasing our premier support package; and (3) revenue from professional services such as implementing best practice use cases, project management and implementation consulting services.
	We recognize revenue when all of the following conditions are met:
	·	there is persuasive evidence of an arrangement;
	·	the service has been provided to the customer;
	·	the collection of fees is reasonably assured; and
	·	the amount of fees to be paid by the customer is fixed or determinable.
	We typically invoice our customers at the beginning of the term, in multiyear, annual, quarterly or monthly installments. Our subscription and support contracts are typically non-cancellable and do not contain refund-type provisions.
	In instances where we collect fees in advance of service delivery, revenue under the contract is deferred until we successfully deliver such services.
	Subscription revenue is recognized ratably over the period of the subscription beginning once all requirements for revenue recognition have been met, including provisioning the service so that it is available to our customers. Premier support is sold together with the subscription services, and the term of the premier support is generally the same as the related subscription services arrangement. Accordingly, we recognize premier support revenue in the same manner as the associated subscription hosting service. Professional services revenue is recognized as the services are rendered for time and material contracts, and using the proportional performance method over the period the services are performed for fixed price contracts. Professional services and premier support services revenues were not material for all periods presented.
	We assess collectability based on a number of factors, such as past collection history and creditworthiness of the customer. If management determines collectability is not reasonably assured, we defer revenue recognition until collectability becomes reasonably assured.
	Our arrangements can include multiple elements which may consist of some or all of subscription services, premier support and professional services. When multiple-element arrangements exist, we evaluate whether these individual deliverables should be accounted for as separate units of accounting or one single unit of accounting.
	In order to treat deliverables in a multiple-element arrangement as separate units of accounting, the delivered item or items must have standalone value upon delivery. A delivered item has standalone value to the customer when either (1) any vendor sells that item separately or (2) the customer could resell that item on a standalone basis. Our subscription services have standalone value as such services are often sold separately. Our premier support services do not have standalone value because we and other vendors do not sell premier support services separately. Our professional services have standalone value because there are other vendors which sell the same professional services separately. For new services, we assess standalone value consistently with the foregoing policy. Accordingly, we consider the separate units of accounting in our multiple deliverable arrangements to be the professional services, subscription services or a combined deliverable comprised of subscription services and premier support services. When multiple deliverables included in an arrangement are separable into different units of accounting, the arrangement consideration is allocated to the identified separate units of accounting based on their relative selling price. Multiple-element arrangement accounting guidance provides a hierarchy to use when determining the relative selling price for each unit of accounting. Vendor-specific objective evidence (VSOE) of selling price, based on the price at which the item is regularly sold by the vendor on a standalone basis, should be used if it exists. If VSOE of selling price is not available, third-party evidence (TPE) of selling price is used to establish the selling price if it exists. We have not established VSOE for our subscription services, premier support or professional services due to lack of pricing consistency, the introduction of new services and other factors. We have also concluded that third-party evidence of selling price is not a practical alternative due to differences in our service offerings compared to other parties and the availability of relevant third-party pricing information. Accordingly, we use our best estimate of selling price (BESP) to determine the relative selling price for our subscription, premier support and professional services offerings. For arrangements with multiple deliverables which can be separated into different units of accounting, we allocate the arrangement fee to the separate units of accounting based on our BESP. The amount of arrangement fee allocated is limited by contingent revenue, if any.
	We determined BESP by considering our overall pricing objectives and market conditions. Significant pricing practices taken into consideration for our subscription services, which may also include premier support, and professional services, include discounting practices, the size and volume of our transactions, the customer demographic, the geographic area where services are sold, price lists, our go-to-market strategy, historical standalone sales and contract prices. The determination of BESP is made through consultation with and approval by our management, taking into consideration the go-to-market strategy. As our go-to-market strategies evolve, we may modify our pricing practices in the future, which could result in changes in relative selling prices.
Certain Risks and Concentrations	Certain Risks and Concentrations
	Our financial instruments that are exposed to concentrations of credit risk consist primarily of cash and cash equivalents, marketable securities, restricted cash and accounts receivable. Although we deposit our cash with multiple financial institutions, our deposits, at times, may exceed federally insured limits.
	We sell to a broad range of customers. Our revenue is derived substantially from the U.S. across a multitude of industries. Accounts receivable are derived from the delivery of our services to customers primarily located in the U.S. We accept and settle our accounts receivable using credit cards, electronic payments and checks. A majority of our lower dollar value invoices are settled by credit card on or near the date of the invoice. We do not require collateral from customers to secure accounts receivable. We maintain an allowance for accounts receivable based upon the expected collectability, which takes into consideration specific customer creditworthiness and current economic trends. We believe collections of our accounts receivable are reasonably assured based on the size, industry diversification, financial condition and past transaction history of our customers. As of April 30, 2015, we had one reseller who accounted for 14% of total accounts receivable. As of January 31, 2015, no single customer accounted for more than 10% of total accounts receivable. No single customer represented over 10% of revenue during the three months ended April 30, 2015 and 2014.
	We serve our customers and users from datacenter facilities operated by third parties. In order to reduce the risk of down time of our enterprise cloud content management services, we have established datacenters in various locations in the United States. We have internal procedures to restore services in the event of disaster at one of our current datacenter facilities. Even with these procedures for disaster recovery in place, our cloud services could be significantly interrupted during the implementation of the procedures to restore services.
	Geographic Locations
	For the three months ended April 30, 2015 and 2014, revenue attributed to the United States was approximately 80%, and no other country outside of the United States comprised 10% or greater of our revenue.
	Substantially all of our net assets are located in the United States. As of April 30, 2015 and January 31, 2015, property and equipment located in the United States was approximately 98%.
Foreign Currency Translation and Transactions	Foreign Currency Translation and Transactions
	The functional currency of our principal foreign subsidiaries is generally the U.S. dollar. Adjustments resulting from translating foreign functional currency financial statements into U.S. dollars for those entities that do not have U.S. dollars as their functional currency are recorded as part of a separate component of the consolidated statements of comprehensive loss. Foreign currency transaction gains and losses are included in the consolidated statements of operations for the period. All assets and liabilities denominated in a foreign currency are translated into U.S. dollars at the exchange rate on the balance sheet date. Revenue and expenses are translated at the average exchange rate during the period. Equity transactions are translated using historical exchange rates. Translation adjustments at the balance sheet dates were not material. Transaction gains and losses recognized were not material for all periods presented.
Restricted Cash	Restricted Cash
	Restricted cash is comprised of certificates of deposit and money market funds related to our credit card processing and leases.
Marketable Securities	Marketable Securities
	Our marketable securities consisted of corporate paper, U.S. government agency obligations, corporate debt securities, asset-backed securities and U.S. government obligations. We classify our marketable securities as available-for-sale at the time of purchase and reevaluate such classification as of each balance sheet date. We may sell these securities at any time for use in current operations or for other purposes, such as consideration for acquisitions, even if they have not yet reached maturity. As a result, we classify our investments, including securities with maturities beyond twelve months as current assets in the accompanying consolidated balance sheets. All marketable securities are recorded at their estimated fair value. Unrealized gains and losses for available-for-sale securities are recorded in other comprehensive income (loss). We evaluate our investments to assess whether those with unrealized loss positions are other than temporarily impaired. We consider impairments to be other than temporary if they are related to deterioration in credit risk or if it is likely we will sell the securities before the recovery of their cost basis. Realized gains and losses and declines in value deemed to be other than temporary are determined based on the specific identification method and are reported in other income (expense), net in the consolidated statements of operations.
Recent Accounting Pronouncements	Recent Accounting Pronouncement
	In May 2015, the FASB issued ASU 2015-07, Disclosures for Investments in Certain Entities That Calculate Net Asset Value Per Share (or Its Equivalent), which amends ASC 820, Fair Value Measurement. The standard removes the requirement to categorize within the fair value hierarchy investments for which fair value is measured using the net asset value per share practical expedient and removes certain related disclosure requirements. The standard will be effective for our fiscal year beginning February 1, 2016. We do not expect the standard to have a material impact on our consolidated financial statements.
	In May 2014, the FASB issued ASU 2014-09 regarding ASC Topic 606, Revenue from Contracts with Customers. The standard provides principles for recognizing revenue for the transfer of promised goods or services to customers with the consideration to which the entity expects to be entitled in exchange for those goods or services. The standard will be effective for our fiscal year beginning February 1, 2017. We are currently in the process of assessing the adoption methodology, which allows the amendment to be applied retrospectively to each prior period presented, or with the cumulative effect recognized as of the date of initial application. We are also evaluating the impact of the adoption of this standard on our consolidated financial statements and have not determined whether the effect will be material.
Fair Value of Financial Instruments	We define fair value as the exchange price that would be received from selling an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. We measure our financial assets and liabilities at fair value at each reporting period using a fair value hierarchy which requires us to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. A financial instrument’s classification within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. Three levels of inputs may be used to measure fair value:
	·	Level 1—Observable inputs are unadjusted quoted prices in active markets for identical assets or liabilities.
	·	Level 2—Observable inputs are quoted prices for similar assets and liabilities in active markets or inputs other than quoted prices which are observable for the assets or liabilities, either directly or indirectly through market corroboration, for substantially the full term of the financial instruments.
	·	Level 3—Unobservable inputs which are supported by little or no market activity and which are significant to the fair value of the assets or liabilities. These inputs are based on our own assumptions used to measure assets and liabilities at fair value and require significant management judgment or estimation.
	We measure our marketable securities and restricted cash at fair value on a recurring basis. We classify our marketable securities and restricted cash within Level 1 or Level 2 because they are valued using either quoted market prices for identical assets or inputs other than quoted prices which are directly or indirectly observable in the market, including readily-available pricing sources for the identical underlying security which may not be actively traded.
Stock-Based Compensation	The assumptions used in the Black-Scholes option pricing model were determined as follows:
	Fair Value of Common Stock. Prior to our IPO in January 2015, our board of directors considered numerous objective and subjective factors to determine the fair value of our common stock at each grant date. These factors included, but were not limited to, (i) contemporaneous valuations of common stock performed by unrelated third-party specialists; (ii) the prices for our redeemable convertible preferred stock sold to outside investors; (iii) the rights, preferences and privileges of our redeemable convertible preferred stock relative to our common stock; (iv) the lack of marketability of our common stock; (v) developments in the business; and (vi) the likelihood of achieving a liquidity event, such as an IPO or a merger or acquisition, given prevailing market conditions.
	Subsequent to the completion of our IPO, we use the market closing price for our Class A common stock as reported on the New York Stock Exchange.
	Expected Term. The expected term represents the period that our share-based awards are expected to be outstanding. The expected term assumptions were determined based on the vesting terms, exercise terms and contractual lives of the options and ESPP purchase rights.
	Expected Volatility. Since we do not have sufficient trading history of our common stock, the expected volatility was derived from the historical stock volatilities of several unrelated public companies within the same industry that we consider to be comparable to our business over a period equivalent to the expected term of the stock option grants and ESPP purchase rights.
	Risk-free Interest Rate. The risk-free rate that we use is based on U.S. Treasury zero-coupon issues with remaining terms similar to the expected term on the options.
	Dividend Yield. We have never declared or paid any cash dividends and do not plan to pay cash dividends in the foreseeable future, and, therefore, use an expected dividend yield of zero.
Net Loss per Share Attributable to Common Stockholders	We calculate our basic and diluted net loss per share attributable to common stockholders in conformity with the two-class method required for companies with participating securities. We consider all series of our redeemable convertible preferred stock to be participating securities. In the event a dividend is declared or paid on our common stock, holders of redeemable convertible preferred stock are entitled to a proportionate share of such dividend in proportion to the holders of common stock on an as-if converted basis. Under the two-class method, basic net loss per share attributable to common stockholders is calculated by dividing the net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding for the period, less shares subject to repurchase. Net loss attributable to common stockholders is determined by allocating undistributed earnings between common and redeemable convertible preferred stockholders. The diluted net loss per share attributable to common stockholders is computed by giving effect to all potential dilutive common stock equivalents outstanding for the period. For purposes of this calculation, redeemable convertible preferred stock, options to purchase common stock, restricted stock units, employee stock purchase plan, warrants to purchase redeemable convertible preferred stock, repurchasable shares from early exercised options and unvested restricted stock, and contingently issuable common stock authorized in connection with certain acquisitions are considered common stock equivalents but have been excluded from the calculation of diluted net loss per share attributable to common stockholders as their effect is antidilutive. Under the two-class method, the net loss attributable to common stockholders is not allocated to the convertible redeemable preferred stock as the holders of our convertible redeemable preferred stock do not have a contractual obligation to share in our losses.
Income Taxes	We evaluate tax positions for recognition using a more-likely-than-not recognition threshold, and those tax positions eligible for recognition are measured as the largest amount of tax benefit that is greater than 50% likely of being realized upon the effective settlement with a taxing authority that has full knowledge of all relevant information

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Apr. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value of Assets and Liabilities Measured at Fair Value on Recurring Basis	The following tables set forth the fair value of our financial assets and liabilities measured at fair value on a recurring basis as of April 30, 2015 and January 31, 2015, using the above input categories (in thousands):
		30-Apr-15
		Level 1		Level 2		Level 3		Fair Value
	Assets
	Cash and cash equivalents:
	Corporate paper		—	$	21,695		—	$	21,695
	Marketable securities:
	Corporate paper		—		40,810		—		40,810
	U.S. government agency obligations		—		20,295		—		20,295
	Corporate debt securities		—		15,515		—		15,515
	Asset-backed securities		—		15,334		—		15,334
	U.S. government obligations		—		12,035		—		12,035
	Restricted cash:
	Certificates of deposit		—		27,165		—		27,165
	Money market funds		1,202		—		—		1,202
	Total assets measured at fair value	$	1,202	$	152,849	$	—	$	154,051
		31-Jan-15
		Level 1		Level 2		Level 3		Fair Value
	Assets
	Restricted cash:
	Certificates of deposit	$	—	$	3,367	$	—	$	3,367
	Total assets measured at fair value	$	—	$	3,367	$	—	$	3,367

Marketable_Securities_Tables

Marketable Securities (Tables)	3 Months Ended
	Apr. 30, 2015
Investments Debt And Equity Securities [Abstract]
Summary of Cash Equivalents and Marketable Securities	The following is a summary of our cash equivalents and marketable securities as of April 30, 2015 (in thousands).
		30-Apr-15
		Amortized		Unrealized		Unrealized			Estimated
		Cost		Gain		Loss			Fair Value
	Corporate paper	$	62,496	$	10	$	(1	)	$	62,505
	U.S. government agency obligations		20,295		1		(1	)		20,295
	Corporate debt securities		15,518		4		(7	)		15,515
	Asset-backed securities		15,335		1		(2	)		15,334
	U.S. government obligations		12,037		—		(2	)		12,035
		$	125,681	$	16	$	(13	)	$	125,684
	Included in cash and cash equivalents	$	21,692	$	3	$	—		$	21,695
	Included in marketable investments	$	103,989	$	13	$	(13	)	$	103,989
Amortized Cost and Estimated Fair Value of Cash Equivalents and Marketable Securities by Contractual Maturity	The amortized cost and estimated fair value of our cash equivalents and marketable securities as of April 30, 2015 are shown below by contractual maturity (in thousands).
		30-Apr-15
		Amortized		Estimated
		Cost		Fair Value
	Less than one year	$	112,196	$	112,200
	Due in one to five years		13,485		13,484
		$	125,681	$	125,684

Balance_Sheet_Components_Table

Balance Sheet Components (Tables)	3 Months Ended
	Apr. 30, 2015
Balance Sheet Components [Abstract]
Schedule of Prepaid Expenses and Other Current Assets	Prepaid expenses and other current assets consisted of the following (in thousands):
		April 30,			January 31,
		2015			2015
	Tenant incentives receivable under our new headquarters	$	23,395		$	—
	lease in Redwood City (see Note 8)
	Other		15,861			12,132
	Total prepaid expenses and other current assets	$	39,256		$	12,132
Schedule of Property and Equipment, Net	Property and equipment, net consisted of the following (in thousands):
		April 30,			January 31,
		2015			2015
	Servers	$	86,857		$	81,068
	Leasehold improvements		13,899			13,400
	Computer hardware and software		9,105			8,724
	Furniture and fixtures		5,334			5,046
	Construction in progress		6,691			4,815
	Total property and equipment		121,886			113,053
	Less: accumulated depreciation		(62,627	)		(54,607	)
	Total property and equipment, net	$	59,259		$	58,446

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	3 Months Ended
	Apr. 30, 2015
Goodwill And Intangible Assets Disclosure [Abstract]
Summary of Goodwill Activity	Goodwill activity is reflected in the following table (in thousands):
	Balance as of January 31, 2015	$	11,242
	Goodwill acquired		415
	Balance as of April 30, 2015	$	11,657
Schedule of Components of Intangible Assets	Intangible assets consisted of the following (in thousands):
		Weighted			Gross Value		Accumulated			Net Carrying
		Average Useful					Amortization			Value
		Life (1)
	30-Apr-15
	Developed technology		2.6	years	$	11,473	$	(6,375	)	$	5,098
	Trade name and other		6.9	years		1,201		(753	)		448
	Intangibles, net				$	12,674	$	(7,128	)	$	5,546
	31-Jan-15
	Developed technology		2.7	years	$	11,124	$	(5,268	)	$	5,856
	Trade name and other		6.9	years		1,201		(714	)		487
	Intangibles, net				$	12,325	$	(5,982	)	$	6,343
	-1	From the date of acquisition
Schedule of Expected Amortization Expense of Intangible Assets	As of April 30, 2015, expected amortization expense for intangible assets was as follows (in thousands):
	Years ending January 31:
	Remainder of 2016	$	3,401
	2017		1,952
	2018		169
	2019		23
	2020		1
		$	5,546

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	3 Months Ended
	Apr. 30, 2015
Commitments And Contingencies Disclosure [Abstract]
Future Minimum Lease Payments under Non-cancellable Capital and Operating Leases	As of April 30, 2015, future minimum lease payments under non-cancellable capital and operating leases are as follows (in thousands):
	Years ending January 31:	Capital			Operating
		Leases			Leases
	Remainder of 2016	$	951		$	4,142
	2017		1,267			12,191
	2018		1,190			17,857
	2019		66			19,478
	2020		—			22,172
	Thereafter		—			190,660
	Total minimum lease payments	$	3,474		$	266,500
	Less: amount representing interest		(163	)
	Present value of minimum lease payments	$	3,311
Future Payments under Non-cancellable Contractual Purchases	As of April 30, 2015, future payments under non-cancellable contractual purchases, which relate primarily to datacenter operations and marketing activities, are as follows (in thousands):
	Years ending January 31:
	Remainder of 2016	$	14,922
	2017		11,244
	2018		3,083
		$	29,249

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	3 Months Ended
	Apr. 30, 2015
Summary of Stock Option Activity Under Equity Incentive Plans and Related Information	The following table summarizes the stock option activity under the equity incentive plans and related information:
		Shares Subject to Options Outstanding						Weighted-Average
		Shares Subject to				Weighted-		Remaining
		Outstanding				Average Exercise		Contractual Life				Aggregate
		Options				Price		(Years)				Intrinsic Value
												(in thousands)
	Balance as of January 31, 2015		17,465,571			$	5.67		7.8			$	229,713
	Options granted		342,980				17.54
	Option exercised		(350,096	)			3.09
	Options forfeited/cancelled		(563,225	)			6.92
	Balance as of April 30, 2015		16,895,230			$	5.92		7.6			$	190,236
	Vested and expected to vest as of April 30, 2015		16,628,973			$	5.85		7.58			$	188,405
	Exercisable as of April 30, 2015		8,924,686			$	3.5		6.98			$	121,735
Summary of Components of Stock-Based Compensation Expense	The following table summarizes the components of stock-based compensation expense recognized in the consolidated statements of operations (in thousands):
		Three Months Ended
		April 30,
		2015				2014
	Cost of revenue	$	851			$	226
	Research and development		5,263				2,008
	Sales and marketing		4,283				2,065
	General and administrative		2,318				1,453
	Net loss attributable to common stockholders	$	12,715			$	5,752
Summary of Estimated Fair Value of Employee Stock Options	We estimated the fair value of employee stock options and ESPP purchase rights using a Black-Scholes option pricing model with the following assumptions:
		Three Months Ended
		April 30,
		2015						2014
	Employee Stock Options
	Expected term (in years)		6		-		6.1	5.7	-	6.1
	Risk-free interest rate		1.6	%	-		1.70%				2.10%
	Volatility		43	%	-		44%				49%
	Dividend yield						0%			0%
	Employee Stock Purchase Plan
	Expected term (in years)	0.5			-		2				—
	Risk-free interest rate		0.2	%	-		0.70%				—
	Volatility		39	%	-		41%				—
	Dividend yield						0%				—
Restricted Stock Units
Summary of Restricted Stock Unit Activity Under Equity Incentive Plans and Related Information	The following table summarizes the restricted stock unit activity under the equity incentive plans and related information:
		Number of				Weighted-
		Restricted				Average
		Stock Units				Grant Date
		Outstanding				Fair Value
	Unvested balance - January 31, 2015		4,939,709			$	15.66
	Granted		2,673,044				17.54
	Vested, net of shares withheld for employee payroll taxes		(348,962	)			17.77
	Forfeited/cancelled, including shares withheld for employee payroll taxes		(430,831	)			17.17
	Unvested balance - April 30, 2015		6,832,960			$	16.19
Restricted Stock
Summary of Restricted Stock Award Activity Under Equity Incentive Plans and Related Information	The following table summarizes the restricted stock activity under the equity incentive plans and related information:
		Number of				Weighted-
		Restricted				Average
		Stock				Grant Date
		Outstanding				Fair Value
	Unvested balance - January 31, 2015		172,661			$	9.6
	Granted		23,364				17.54
	Vested		(21,516	)			14.99
	Forfeited/cancelled, including shares withheld for employee payroll taxes		(7,790	)			17.54
	Unvested balance - April 30, 2015		166,719			$	9.65

Net_Loss_Per_Share_Attributabl1

Net Loss Per Share Attributable to Common Stockholders (Tables)	3 Months Ended
	Apr. 30, 2015
Earnings Per Share [Abstract]
Summary of Computation of Basic and Diluted Net Loss Per Share	The following table sets forth the computation of basic and diluted net loss per share (in thousands, except per share amounts):
		Three Months Ended April 30,
		2015						2014
		Class A			Class B			Class A		Class B
	Numerator:
	Net loss	$	(6,031	)	$	(41,252	)	$	—	$	(38,511	)
	Add: accretion of redeemable convertible		—			—			—		(43	)
	preferred stock
	Net loss attributable to common stockholders	$	(6,031	)	$	(41,252	)	$	—	$	(38,554	)
	Denominator:
	Weighted-average number of shares outstanding—		15,226			104,153			—		13,734
	basic and diluted
	Net loss per share attributable to common	$	(0.40	)	$	(0.40	)	$	—	$	(2.81	)
	stockholders—basic and diluted
Summary of Weighted Average Outstanding Shares Excluded from Computation of Diluted Net Loss per Share	The following weighted-average outstanding shares of common stock equivalents were excluded from the computation of diluted net loss per share attributable to common stockholders for the periods presented because the impact of including them would have been antidilutive (in thousands):
		Three Months Ended April 30,
		2015			2014
	Redeemable convertible preferred stock		—			76,238
	Options to purchase common stock		17,077			18,247
	Restricted stock units		5,663			1,070
	Employee stock purchase plan		3,263			—
	Warrants to purchase redeemable convertible		—			87
	preferred stock
	Repurchasable shares from early-exercised options		651			674
	and unvested restricted stock
	Contingently issuable common stock		161			—
			26,815			96,316

Summary_of_Significant_Account2

Summary of Significant Accounting Policies - Additional Information (Details)	3 Months Ended	0 Months Ended			3 Months Ended
	Apr. 30, 2015	Apr. 30, 2015	Jan. 31, 2015	Apr. 30, 2014	Apr. 30, 2014
	Source	Customer	Customer	Customer
Concentration Risk [Line Items]
Number of revenue sources	3
Credit Concentration Risk | Accounts Receivable
Concentration Risk [Line Items]
Number of major customer	1	1	0
Concentration risk percentage		14.00%	10.00%
Customer Concentration Risk | Revenue
Concentration Risk [Line Items]
Number of major customer	0	0		0	0
Concentration risk percentage				10.00%
Customer Concentration Risk | Revenue | United States
Concentration Risk [Line Items]
Concentration risk percentage	80.00%				80.00%
Geographic Concentration Risk | Property and Equipment | United States
Concentration Risk [Line Items]
Concentration risk percentage		98.00%	98.00%

Fair_Value_Measurements_Fair_V

Fair Value Measurements - Fair Value of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) (USD $)	Apr. 30, 2015	Jan. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities	$125,684,000	$0
Corporate Paper
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities	62,505,000
U.S. Government Agency Obligations
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities	20,295,000
Corporate Debt Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities	15,515,000
Asset-backed Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities	15,334,000
U.S. Government Obligations
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities	12,035,000
Fair Value Measurements Recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total assets measured at fair value	154,051,000	3,367,000
Fair Value Measurements Recurring | Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total assets measured at fair value	1,202,000
Fair Value Measurements Recurring | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total assets measured at fair value	152,849,000	3,367,000
Fair Value Measurements Recurring | Corporate Paper
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash and cash equivalent	21,695,000
Marketable securities	40,810,000
Fair Value Measurements Recurring | Corporate Paper | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash and cash equivalent	21,695,000
Marketable securities	40,810,000
Fair Value Measurements Recurring | U.S. Government Agency Obligations
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities	20,295,000
Fair Value Measurements Recurring | U.S. Government Agency Obligations | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities	20,295,000
Fair Value Measurements Recurring | Corporate Debt Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities	15,515,000
Fair Value Measurements Recurring | Corporate Debt Securities | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities	15,515,000
Fair Value Measurements Recurring | Asset-backed Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities	15,334,000
Fair Value Measurements Recurring | Asset-backed Securities | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities	15,334,000
Fair Value Measurements Recurring | U.S. Government Obligations
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities	12,035,000
Fair Value Measurements Recurring | U.S. Government Obligations | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities	12,035,000
Fair Value Measurements Recurring | Certificates of Deposit
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Restricted cash	27,165,000	3,367,000
Fair Value Measurements Recurring | Certificates of Deposit | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Restricted cash	27,165,000	3,367,000
Fair Value Measurements Recurring | Money Market Funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Restricted cash	1,202,000
Fair Value Measurements Recurring | Money Market Funds | Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Restricted cash	$1,202,000

Marketable_Securities_Addition

Marketable Securities - Additional Information (Details) (USD $)	3 Months Ended
	Apr. 30, 2015	Jan. 31, 2015
Investments Debt And Equity Securities [Abstract]
Cash equivalents		$0
Marketable securities	125,684,000	0
Unrealized loss position for greater than 12 months	$0

Marketable_Securities_Summary_

Marketable Securities - Summary of Cash Equivalents and Marketable Securities (Details) (USD $)	Apr. 30, 2015	Jan. 31, 2015
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$125,681,000
Unrealized Gain	16,000
Unrealized Loss	-13,000
Marketable securities	125,684,000	0
Corporate Paper
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	62,496,000
Unrealized Gain	10,000
Unrealized Loss	-1,000
Marketable securities	62,505,000
U.S. Government Agency Obligations
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	20,295,000
Unrealized Gain	1,000
Unrealized Loss	-1,000
Marketable securities	20,295,000
Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	15,518,000
Unrealized Gain	4,000
Unrealized Loss	-7,000
Marketable securities	15,515,000
Asset-backed Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	15,335,000
Unrealized Gain	1,000
Unrealized Loss	-2,000
Marketable securities	15,334,000
U.S. Government Obligations
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	12,037,000
Unrealized Loss	-2,000
Marketable securities	12,035,000
Included in Cash and Cash Equivalents
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	21,692,000
Unrealized Gain	3,000
Marketable securities	21,695,000
Included in Marketable Investments
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	103,989,000
Unrealized Gain	13,000
Unrealized Loss	-13,000
Marketable securities	$103,989,000

Marketable_Securities_Amortize

Marketable Securities - Amortized Cost and Estimated Fair Value of Cash Equivalents and Marketable Securities by Contractual Maturity (Details) (USD $)	Apr. 30, 2015	Jan. 31, 2015
Investments Debt And Equity Securities [Abstract]
Amortized Cost, Less than one year	$112,196,000
Amortized Cost, Due in one to five years	13,485,000
Amortized Cost	125,681,000
Estimated Fair Value, Less than one year	112,200,000
Estimated Fair Value, Due in one to five years	13,484,000
Estimated Fair Value, Total	$125,684,000	$0

Balance_Sheet_Components_Sched

Balance Sheet Components - Schedule of Prepaid Expenses and Other Current Assets (Details) (USD $)	Apr. 30, 2015	Jan. 31, 2015
In Thousands, unless otherwise specified
Balance Sheet Components [Abstract]
Tenant incentives receivable under our new headquarters lease in Redwood City (see Note 8)	$23,395
Other	15,861	12,132
Total prepaid expenses and other current assets	$39,256	$12,132

Balance_Sheet_Components_Sched1

Balance Sheet Components - Schedule of Property and Equipment, Net (Details) (USD $)	Apr. 30, 2015	Jan. 31, 2015
In Thousands, unless otherwise specified
Property Plant And Equipment [Line Items]
Total property and equipment, gross	$121,886	$113,053
Less: accumulated depreciation	-62,627	-54,607
Total property and equipment, net	59,259	58,446
Servers
Property Plant And Equipment [Line Items]
Total property and equipment, gross	86,857	81,068
Leasehold improvements
Property Plant And Equipment [Line Items]
Total property and equipment, gross	13,899	13,400
Computer hardware and software
Property Plant And Equipment [Line Items]
Total property and equipment, gross	9,105	8,724
Furniture and fixtures
Property Plant And Equipment [Line Items]
Total property and equipment, gross	5,334	5,046
Construction in progress
Property Plant And Equipment [Line Items]
Total property and equipment, gross	$6,691	$4,815

Balance_Sheet_Components_Addit

Balance Sheet Components - Additional Information (Details) (USD $)	3 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Jan. 31, 2015
Property Plant And Equipment [Line Items]
Accumulated depreciation of property and equipment acquired under capital lease	$355,000		$140,000
Depreciation expense	8,000,000	5,200,000
Amount of interest capitalized to property and equipment	6,000	89,000
Servers
Property Plant And Equipment [Line Items]
Gross amount of property and equipment acquired under capital lease	2,400,000		1,900,000
Depreciation expense	214,000	0
Construction in Progress
Property Plant And Equipment [Line Items]
Gross amount of property and equipment acquired under capital lease	$1,300,000		$69,000

Acquisitions_Additional_Inform

Acquisitions - Additional Information (Details) (USD $)	3 Months Ended
	Apr. 30, 2015
	Company
Business Acquisition [Line Items]
Number of companies acquired	2
Business acquisition, aggregate purchase price	$764,000
Business acquisition, goodwill	415,000
Developed Technology
Business Acquisition [Line Items]
Business acquisition, developed technology	$349,000
Weighted average useful life	2 years

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets - Summary of Goodwill Activity (Details) (USD $)	3 Months Ended
	Apr. 30, 2015
Goodwill - Roll forward
Beginning Balance	$11,242,000
Business acquisition, goodwill	415,000
Ending Balance	$11,657,000

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets - Schedule of Components of Intangible Assets (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Apr. 30, 2015		Jan. 31, 2015
Finite Lived Intangible Assets [Line Items]
Gross Value	$12,674		$12,325
Accumulated Amortization	-7,128		-5,982
Net Carrying Value	5,546		6,343
Developed technology
Finite Lived Intangible Assets [Line Items]
Weighted Average Useful Life	2 years 7 months 6 days	[1]	2 years 8 months 12 days	[1]
Gross Value	11,473		11,124
Accumulated Amortization	-6,375		-5,268
Net Carrying Value	5,098		5,856
Trade name and other
Finite Lived Intangible Assets [Line Items]
Weighted Average Useful Life	6 years 10 months 24 days	[1]	6 years 10 months 24 days	[1]
Gross Value	1,201		1,201
Accumulated Amortization	-753		-714
Net Carrying Value	$448		$487
[1]	From the date of acquisition

Goodwill_and_Intangible_Assets4

Goodwill and Intangible Assets - Additional Information (Details) (USD $)	3 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$1,100,000	$695,000

Goodwill_and_Intangible_Assets5

Goodwill and Intangible Assets - Schedule of Expected Amortization Expense of Intangible Assets (Details) (USD $)	Apr. 30, 2015	Jan. 31, 2015
In Thousands, unless otherwise specified
Goodwill And Intangible Assets Disclosure [Abstract]
Remainder of 2016	$3,401
2017	1,952
2018	169
2019	23
2020	1
Net Carrying Value	$5,546	$6,343

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Details) (USD $)	3 Months Ended		0 Months Ended	12 Months Ended	1 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Feb. 13, 2015	Jan. 31, 2015	Mar. 31, 2015
Commitments And Contingencies [Line Items]
Letters of credit facility	$27,000,000			$27,000,000
Letters of credit, maturity date	1-Dec-18
Capital lease term	3 years
Non-cancellable sublease payments	12,600,000
Contingent rent payments	5,500,000
Rent expense	3,700,000	1,400,000
Sublease income	246,000	437,000
Asset retirement obligations	138,000			135,000
Amortization expenses	1,100,000	695,000
Open Text S.A.
Commitments And Contingencies [Line Items]
Damage awarded			4,900,000
Accrual for settlement payable				4,900,000
Litigation settlement expense				3,900,000
Estimated useful life	14 months
Amortization expenses	186,000
Subleases Expires in Fiscal 2018
Commitments And Contingencies [Line Items]
Term of sublease arrangement					18 months
Non-cancellable sublease expiration year	2018
Subleases Expires in Fiscal 2019
Commitments And Contingencies [Line Items]
Term of sublease arrangement	36 months
Non-cancellable sublease expiration year	2019
Minimum
Commitments And Contingencies [Line Items]
Operating lease expiration year	2016
Maximum
Commitments And Contingencies [Line Items]
Operating lease expiration year	2029
Securities Pledged as Collateral
Commitments And Contingencies [Line Items]
Certificate of deposit held as collateral for letter of credit	$27,000,000			$2,000,000

Commitments_and_Contingencies_2

Commitments and Contingencies - Future Minimum Lease Payments under Non-cancellable Capital and Operating Leases (Details) (USD $)	Apr. 30, 2015
In Thousands, unless otherwise specified
Commitments And Contingencies Disclosure [Abstract]
Capital Leases, Remainder of 2016	$951
Capital Leases, 2017	1,267
Capital Leases, 2018	1,190
Capital Leases, 2019	66
Capital Leases, Total minimum lease payments	3,474
Capital Leases, Less: amount representing interest	-163
Capital Leases, Present value of minimum lease payments	3,311
Operating Leases, Remainder of 2016	4,142
Operating Leases, 2017	12,191
Operating Leases, 2018	17,857
Operating Leases, 2019	19,478
Operating Leases, 2020	22,172
Operating Leases, Thereafter	190,660
Operating Leases, Total minimum lease payments	$266,500

Commitments_and_Contingencies_3

Commitments and Contingencies - Future Payments under Non-cancellable Contractual Purchases (Details) (USD $)	Apr. 30, 2015
In Thousands, unless otherwise specified
Unconditional Purchase Obligations Excluding Capital Stock Redemptions [Abstract]
Remainder of 2016	$14,922
2017	11,244
2018	3,083
Total	$29,249

Debt_Additional_Information_De

Debt - Additional Information (Details) (USD $)	1 Months Ended	3 Months Ended		1 Months Ended
	Sep. 30, 2014	Apr. 30, 2015	Apr. 30, 2014	Aug. 31, 2013	Mar. 31, 2015	Jul. 31, 2014
Debt Instrument [Line Items]
Line of credit facility, amount paid down	$6,000,000
Line of credit facility expiration month and year	2016-08
Line of credit facility, interest expense		620,000	523,000
Interest cost capitalized		6,000	89,000
Letter of Credit
Debt Instrument [Line Items]
Line of credit facility, amount drawn	25,000,000				25,000,000
Line of credit facility, interest rate	3.25%
Secured Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility	75,000,000	60,000,000		100,000,000
Line of credit facility, term				2 years
Line of credit facility, commitment fee percentage				0.50%
Line of credit facility, amount drawn				34,000,000		12,000,000
Line of credit facility, interest rate				3.40%		3.30%
Line of credit facility		40,000,000
Line of credit facility, remaining borrowing capacity		$20,000,000
Secured Revolving Credit Facility | London Interbank Offer Rate (LIBOR)
Debt Instrument [Line Items]
Line of credit facility, floating interest rate				3.00%
Secured Revolving Credit Facility | Alternate Base Rate (ABR)
Debt Instrument [Line Items]
Line of credit facility, floating interest rate				2.00%

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Details) (USD $)	3 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Jan. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Liabilities related to early exercises of stock options	$98,000		$286,000
Unvested shares subject to repurchase	67,499		113,541
Aggregate intrinsic value of exercised options	5,300,000	11,000,000
Aggregate estimated fair value of stock options granted to employees vested	6,100,000	4,400,000
Weighted-average grant date fair value of options granted to employees	$7.70	$8.66
Unrecognized stock-based compensation expense related to stock option	34,700,000
Remaining weighted-average period	2 years 7 months 24 days
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Remaining weighted-average period	3 years 5 months 19 days
Unrecognized stock-based compensation expense	101,100,000
Weighted-Average Grant Date Fair Value, Granted	$17.54
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Remaining weighted-average period	2 years 2 months 9 days
Unrecognized stock-based compensation expense	4,000,000
Shares issued in connection with fiscal 2016 acquisitions	2,500
Weighted-Average Grant Date Fair Value, Granted	$17.54
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Dividend yield	0.00%	0.00%
2015 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options and restricted stock units vesting percentage	25.00%
Options and restricted stock units vesting description	Options and restricted stock units generally vest 25% one year from the vesting commencement date and (a) in the case of options, 1/48th per month thereafter, and (b) in the case of restricted stock units, 1/16th per quarter thereafter
2015 Equity Incentive Plan | Class A Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares common stock reserved for issuance	16,331,626		12,200,000
2015 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares common stock reserved for issuance	3,696,550
Percentage of eligible compensation allowed to employees to purchase shares at a discount			15.00%
Description of offering period excluding initial offering period	Except for the initial offering period, the 2015 ESPP provides for 24-month offering periods beginning March 16 and September 16 of each year, and each offering period will consist of four six-month purchase periods.
Description of initial offering period	The initial offering period began January 23, 2015, and will end on March 15, 2017.
Purchase price of common stock, percentage	85.00%
Unrecognized stock-based compensation expense	13,400,000
2015 Employee Stock Purchase Plan | Class A Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares common stock reserved for issuance			2,500,000
Other Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares common stock reserved for issuance	163,619
Remaining weighted-average period	2 years 1 month 21 days
Unrecognized stock-based compensation expense	$1,400,000

StockBased_Compensation_Summar

Stock-Based Compensation - Summary of Stock Option Activity Under Equity Incentive Plans and Related Information (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Apr. 30, 2015	Jan. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares Subject to Outstanding Options, Beginning balance	17,465,571
Shares Subject to Outstanding Options, Options granted	342,980
Shares Subject to Outstanding Options, Options exercised	-350,096
Shares Subject to Outstanding Options, Options forfeited/cancelled	-563,225
Shares Subject to Outstanding Options, Ending balance	16,895,230	17,465,571
Shares Subject to Outstanding Options, Vested and expected to vest	16,628,973
Shares Subject to Outstanding Options, Exercisable	8,924,686
Weighted Average Exercise Price, Beginning Balance	$5.67
Weighted Average Exercise Price, Options granted	$17.54
Weighted Average Exercise Price, Options exercised	$3.09
Weighted Average Exercise Price, Options forfeited/cancelled	$6.92
Weighted Average Exercise Price, Ending Balance	$5.92	$5.67
Weighted Average Exercise Price, Vested and expected to vest	$5.85
Weighted Average Exercise Price, Exercisable	$3.50
Weighted Average Remaining Contractual Life (Years)	7 years 7 months 6 days	7 years 9 months 18 days
Weighted Average Remaining Contractual Life (Years), Vested and expected to vest	7 years 6 months 29 days
Weighted Average Remaining Contractual Life (Years), Exercisable	6 years 11 months 23 days
Aggregate Intrinsic Value, Beginning Balance	$229,713
Aggregate Intrinsic Value, Ending Balance	190,236	229,713
Aggregate Intrinsic Value, Vested and expected to vest	188,405
Aggregate Intrinsic Value, Exercisable	$121,735

StockBased_Compensation_Summar1

Stock-Based Compensation - Summary of Restricted Stock Unit Activity Under Equity Incentive Plans and Related Information (Details) (USD $)	3 Months Ended
	Apr. 30, 2015
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Restricted Stock Units/Awards Outstanding, Unvested Beginning Balance	4,939,709
Number of Restricted Stock Units/Awards Outstanding Granted	2,673,044
Number of Restricted Stock Units/Awards Outstanding, Vested	-348,962
Number of Restricted Stock Units/Awards Outstanding, Forfeited/cancelled	-430,831
Number of Restricted Stock Units/Awards Outstanding Unvested Ending Balance	6,832,960
Weighted-Average Grant Date Fair Value, Unvested Beginning Balance	$15.66
Weighted-Average Grant Date Fair Value, Granted	$17.54
Weighted-Average Grant Date Fair Value, Vested	$17.77
Weighted-Average Grant Date Fair Value, Forfeited/cancelled	$17.17
Weighted-Average Grant Date Fair Value, Unvested Ending Balance	$16.19
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Restricted Stock Units/Awards Outstanding, Unvested Beginning Balance	172,661
Number of Restricted Stock Units/Awards Outstanding Granted	23,364
Number of Restricted Stock Units/Awards Outstanding, Vested	-21,516
Number of Restricted Stock Units/Awards Outstanding, Forfeited/cancelled	-7,790
Number of Restricted Stock Units/Awards Outstanding Unvested Ending Balance	166,719
Weighted-Average Grant Date Fair Value, Unvested Beginning Balance	$9.60
Weighted-Average Grant Date Fair Value, Granted	$17.54
Weighted-Average Grant Date Fair Value, Vested	$14.99
Weighted-Average Grant Date Fair Value, Forfeited/cancelled	$17.54
Weighted-Average Grant Date Fair Value, Unvested Ending Balance	$9.65

StockBased_Compensation_Summar2

Stock-Based Compensation - Summary of Components of Stock-Based Compensation Expense (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Apr. 30, 2015	Apr. 30, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$12,715	$5,752
Cost of Revenue
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	851	226
Research and Development
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	5,263	2,008
Sales and Marketing
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	4,283	2,065
General and Administrative
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$2,318	$1,453

StockBased_Compensation_Summar3

Stock-Based Compensation - Summary of Estimated Fair Value of Employee Stock Options (Details)	3 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate, Minimum	0.20%
Risk-free interest rate, Maximum	0.70%
Volatility, Minimum	39.00%
Volatility, Maximum	41.00%
Dividend yield	0.00%
Employee Stock Purchase Plan | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	6 months	0 years
Employee Stock Purchase Plan | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	2 years
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate, Minimum	1.60%
Risk-free interest rate, Maximum	1.70%
Risk-free interest rate		2.10%
Volatility, Minimum	43.00%
Volatility, Maximum	44.00%
Volatility		49.00%
Dividend yield	0.00%	0.00%
Employee Stock Option | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	6 years	5 years 8 months 12 days
Employee Stock Option | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	6 years 1 month 6 days	6 years 1 month 6 days

Recovered_Sheet1

Net Loss per Share Attributable to Common Stockholders - Summary of Computation of Basic and Diluted Net Loss Per Share (Details) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Apr. 30, 2015	Apr. 30, 2014
Numerator:
Net loss	($47,283)	($38,511)
Add: accretion of redeemable convertible preferred stock		-43
Net loss attributable to common stockholders	-47,283	-38,554
Denominator:
Weighted-average number of shares outstanding—basic and diluted	119,379	13,734
Net loss per share attributable to common stockholders—basic and diluted	($0.40)	($2.81)
Class A Common Stock
Numerator:
Net loss	-6,031
Net loss attributable to common stockholders	-6,031
Denominator:
Weighted-average number of shares outstanding—basic and diluted	15,226
Net loss per share attributable to common stockholders—basic and diluted	($0.40)
Class B Common Stock
Numerator:
Net loss	-41,252	-38,511
Add: accretion of redeemable convertible preferred stock		-43
Net loss attributable to common stockholders	($41,252)	($38,554)
Denominator:
Weighted-average number of shares outstanding—basic and diluted	104,153	13,734
Net loss per share attributable to common stockholders—basic and diluted	($0.40)	($2.81)

Recovered_Sheet2

Net Loss per Share Attributable to Common Stockholders - Summary of Weighted Average Outstanding Shares Excluded from Computation of Diluted Net Loss per Share (Details)	3 Months Ended
In Thousands, unless otherwise specified	Apr. 30, 2015	Apr. 30, 2014
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	26,815	96,316
Redeemable convertible preferred stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		76,238
Options to purchase common stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	17,077	18,247
Restricted Stock Units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	5,663	1,070
Warrants to purchase redeemable convertible
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		87
Repurchasable shares from early-exercised options and unvested restricted stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	651	674
Contingently issuable common stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	161
Employee Stock Purchase Plan
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	3,263

Segments_Additional_Informatio

Segments - Additional Information (Details)	3 Months Ended
	Apr. 30, 2015
	Segment
Segment Reporting [Abstract]
Number of operating segments	1

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Details) (Verold Inc, Subsequent Event, USD $)	1 Months Ended
In Millions, unless otherwise specified	31-May-15
Verold Inc | Subsequent Event
Subsequent Event [Line Items]
Business acquisition, Purchase price paid in stock	$5.40