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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2014
Income Statement [Abstract]      
Revenue $ 302,704 $ 216,440 $ 124,192
Cost of revenue 87,100 47,273 25,974
Gross profit 215,604 169,167 98,218
Operating expenses:      
Research and development 102,500 66,402 45,967
Sales and marketing 242,184 207,749 171,188
General and administrative 71,923 61,672 39,843
Total operating expenses 416,607 335,823 256,998
Loss from operations (201,003) (166,656) (158,780)
Remeasurement of redeemable convertible preferred stock warrant liability   126 (8,477)
Interest expense, net (1,157) (2,009) (3,705)
Other income (expense), net (98) (257) (26)
Loss before provision (benefit) for income taxes (202,258) (168,796) (170,988)
Provision (benefit) for income taxes 690 (569) (2,431)
Net loss (202,948) (168,227) (168,557)
Accretion of redeemable convertible preferred stock 0 (11,503) (341)
Deemed dividend on the conversion of Series F redeemable convertible preferred stock   (2,262)  
Net loss attributable to common stockholders $ (202,948) $ (181,992) $ (168,898)
Net loss per common share attributable to common stockholders, basic and diluted $ (1.67) $ (11.48) $ (14.89)
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted 121,240 15,854 11,341