Net Loss per Share Attributable to Common Stockholders (Tables)

12 Months Ended

Jan. 31, 2016

Earnings Per Share [Abstract]

Summary of Computation of Basic and Diluted Net Loss per Share Attributable to Common Stockholders

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

	Fiscal Year Ended January 31,
	2014			2015			2016
Net loss	$	(78,561	)	$	(183,231	)		(213,752	)
Weighted-average shares used in computing net loss    per share attributable to common stockholders,    basic and diluted		24,237			27,925			82,460
Net loss per share attributable to common    stockholders, basic and diluted	$	(3.24	)	$	(6.56	)	$	(2.59	)

Summary of Weighted-average Outstanding Shares Excluded from Computation of Diluted Net Loss per Share Attributable to Common Stockholders

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 including them would have been anti-dilutive (in thousands):

	Fiscal Year Ended January 31,
	2014		2015		2016
Convertible preferred stock (on an if-converted    basis)		90,103		117,794		—
Stock options to purchase common stock		33,715		50,429		61,795
Early exercised stock options and restricted    stock awards		9,768		8,047		3,618
Employee stock purchase plan		—		—		170
Total		133,586		176,270		65,583