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Condensed Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Revenue	$ 23,466	$ 17,519	$ 66,258	$ 52,357
Operating expenses:
Cost of revenue	8,261	7,169	24,374	20,426
Research and development	3,419	3,046	11,695	10,679
Selling and marketing	10,081	7,885	31,247	23,215
General and administrative	5,742	5,520	17,318	17,731
Intangible asset amortization	267	267	800	800
Total operating expenses	27,770	23,887	85,434	72,851
Loss from operations	(4,304)	(6,368)	(19,176)	(20,494)
Interest expense	(498)	(815)	(1,427)	(2,423)
Other income, net	333	134	709	353
Net loss	(4,469)	(7,049)	(19,894)	(22,564)
Comprehensive loss	$ (4,469)	$ (7,049)	$ (19,894)	$ (22,564)
Net loss per common share, basic and diluted (in usd per share)	$ (0.12)	$ (0.21)	$ (0.56)	$ (0.67)
Shares used to compute net loss per common share, basic and diluted (in shares)	38,620,036	33,946,748	35,769,623	33,881,705

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