Consolidated Statements of Operations (unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Revenue:        
Subscription and support $ 25,814 $ 17,609 $ 68,807 $ 43,557
Professional services and other 4,331 3,285 10,527 7,839
Total revenue 30,145 20,894 79,334 51,396
Cost of revenue:        
Subscription and support 6,312 4,907 17,335 12,520
Professional services and other 2,326 1,887 6,287 4,717
Total cost of revenue 8,638 6,794 23,622 17,237
Gross profit 21,507 14,100 55,712 34,159
Operating expenses:        
Sales and marketing 17,788 13,172 51,989 38,303
Research and development 9,297 6,525 25,832 17,441
General and administrative 6,689 4,506 18,428 18,475
Total operating expenses 33,774 24,203 96,249 74,219
Loss from operations (12,267) (10,103) (40,537) (40,060)
Other income (expense):        
Interest income 104 6 236 13
Interest expense (31) (28) (54) (72)
Change in fair value of warrant liability (10) (9) 52 (536)
Other expense, net (103) (52) (234) (161)
Total other expense, net (40) (83)   (756)
Loss before income taxes (12,307) (10,186) (40,537) (40,816)
Income tax expense (10) (26) (109) (40)
Net loss (12,317) (10,212) (40,646) (40,856)
Deemed dividend to investors       (632)
Net loss attributable to common stockholders $ (12,317) $ (10,212) $ (40,646) $ (41,488)
Net loss per common share attributable to common stockholders, basic and diluted $ (0.44) $ (1.60) $ (1.47) $ (6.61)
Weighted average common shares used in computing basic and diluted net loss per common share attributable to common stockholders 28,084 6,381 27,667 6,279