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Marketable Securities and Fair Value Measurements - Fair Value of Redeemable Preferred Stock Warrants (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2015	Jan. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Remeasurement of redeemable convertible preferred stock warrant liability	$ (126)	$ 8,477
Redeemable Convertible Preferred Stock | Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning Balance	1,346	2,869
Remeasurement of redeemable convertible preferred stock warrant liability	(126)	8,477
Exercise of redeemable convertible preferred stock warrants	$ (1,220)	(10,000)
Ending Balance		$ 1,346

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- Definition

Fair value of redeemable convertible preferred stock warrants exercised.

+ References

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Amount of expense (income) related to adjustment to fair value of warrant liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section 25
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6939902&loc=d3e20148-110875

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

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