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Condensed Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Revenue	$ 17,519	$ 18,603	$ 52,357	$ 46,828
Operating expenses:
Cost of revenue	7,169	6,367	20,426	18,947
Research and development	3,046	4,006	10,679	11,734
Selling and marketing	7,885	7,087	23,215	22,416
General and administrative	5,520	5,763	17,731	18,062
Intangible asset amortization	267	266	800	800
Total operating expenses	23,887	23,489	72,851	71,959
Loss from operations	(6,368)	(4,886)	(20,494)	(25,131)
Interest expense	(815)	(799)	(2,423)	(1,951)
Other income, net	134	48	353	127
Net loss	(7,049)	(5,637)	(22,564)	(26,955)
Comprehensive loss	$ (7,049)	$ (5,637)	$ (22,564)	$ (26,955)
Net loss per common share, basic and diluted (in usd per share)	$ (0.21)	$ (0.20)	$ (0.67)	$ (0.97)
Shares used to compute net loss per common share, basic and diluted	33,946,748	27,916,819	33,881,705	27,865,100

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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