Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue:
Product	$ 126,281	$ 120,507	$ 97,564
Software subscription and services	25,378	16,785	9,571
Total revenue	151,659	137,292	107,135
Cost of revenue
Product	40,496	38,365	31,431
Software subscription and services	9,897	6,400	4,250
Total cost of revenue	50,393	44,765	35,681
Gross profit	101,266	92,527	71,454
Operating expenses:
Research and development	36,924	27,546	25,742
Sales and marketing	83,066	72,364	57,773
General and administrative	26,303	21,180	17,689
Total operating expenses	146,293	121,090	101,204
Operating loss	(45,027)	(28,563)	(29,750)
Interest income	108	37	15
Interest expense	(1,209)	(1,843)	(604)
Other income (expense), net	285	255	(2,462)
Loss before income taxes	(45,843)	(30,114)	(32,801)
Income tax provision	(352)	(441)	(426)
Net loss	(46,195)	(30,555)	(33,227)
Net loss attributable to common stockholders	$ (46,195)	$ (30,555)	$ (33,227)
Net loss per share allocable to common stockholders, basic and diluted (USD per share)	$ (0.98)	$ (0.85)	$ (4.84)
Weighted-average shares used in computing net loss per share allocable to common stockholders, basic and diluted	47,323,253	36,097,405	6,866,839
Stock-based compensation	$ 18,371	$ 10,252	$ 4,287