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Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Statement [Abstract]      
Revenue $ 65,085 $ 49,503 $ 38,190
Operating Expenses:      
Cost of revenue 25,462 21,497 16,606
Research and development 15,324 12,796 9,804
Selling and marketing 28,248 25,293 21,932
General and administrative 23,787 22,583 18,854
Intangible asset amortization 1,067 800 0
Total operating expenses 93,888 82,969 67,196
Loss from operations (28,803) (33,466) (29,006)
Interest expense (2,757) (378) (439)
Other income, net 202 140 72
Net loss (31,358) (33,704) (29,373)
Comprehensive loss $ (31,358) $ (33,704) $ (29,373)
Net loss per common share, basic and diluted (in dollars per share) $ (1.09) $ (1.30) $ (1.36)
Shares use to compute net loss per common share, basic and diluted (in shares) 28,830,472 25,994,193 21,639,374