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Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Revenue	$ 61,120	$ 47,727	$ 120,025	$ 94,741
Cost of revenue	24,814	20,273	49,516	40,244
Gross profit	36,306	27,454	70,509	54,497
Operating expenses:
Research and development	8,367	6,836	16,139	13,683
Sales and marketing	17,912	16,932	35,390	32,710
General and administrative	9,833	6,845	18,936	15,705
Total operating expenses	36,112	30,613	70,465	62,098
Income (loss) from operations	194	(3,159)	44	(7,601)
Other income (expense), net:
Interest expense	(2,378)	(888)	(3,188)	(1,770)
Interest income and other	206	90	604	208
Total other income (expense), net	(2,172)	(798)	(2,584)	(1,562)
Loss before income taxes	(1,978)	(3,957)	(2,540)	(9,163)
Provision for income taxes	64	50	109	99
Net loss	$ (2,042)	$ (4,007)	$ (2,649)	$ (9,262)
Net loss per share:
Basic and diluted (in USD per share)	$ (0.04)	$ (0.07)	$ (0.05)	$ (0.17)
Shares used in computing net loss per share:
Basic and diluted (in shares)	57,903	54,723	57,453	54,208
Comprehensive Income (Loss):
Net loss and comprehensive loss	$ (2,042)	$ (4,007)	$ (2,649)	$ (9,262)

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