Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Revenue	$ 32,006	$ 22,263
Cost of revenue	9,972	8,693
Gross profit	22,034	13,570
Operating expenses:
Sales and marketing	13,229	9,717
Research and development	7,417	4,725
General and administrative	7,523	6,780
Total operating expenses	28,169	21,222
Loss from operations	(6,135)	(7,652)
Change in fair value of preferred stock warrant		(150)
Interest income	16	3
Interest expense	(328)	(17)
Other income (expense), net	(74)	(39)
Loss before provision for income taxes	(6,521)	(7,855)
Provision for income taxes	73	6
Net loss	(6,594)	(7,861)
Accretion of redeemable convertible preferred stock		(5,459)
Deemed dividend—preferred stock modification		1,748
Net loss attributable to common stockholders	$ (6,594)	$ (11,572)
Net loss per share attributable to common stockholders, basic and diluted	$ (0.17)	$ (1.03)
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted	39,450,020	11,201,755