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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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