Consolidated Statements of Convertible Preferred Stock and Stockholders' (Deficit) Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Convertible Preferred Stock, value per share	$ 0.0001	$ 0.0001
Common Stock
Issuance costs	$ 4,539
Series E Convertible Preferred Stock
Convertible Preferred Stock, value per share		6.93	$ 6.93
Convertible preferred stock, issuance costs			$ 3,354
Series F Convertible Preferred Stock
Convertible Preferred Stock, value per share		$ 15.73
Convertible preferred stock, issuance costs		$ 4,197
Series F-1 Convertible Preferred Stock
Convertible Preferred Stock, value per share		$ 15.73
Convertible preferred stock, issuance costs		$ 69