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