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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Statement [Abstract]        
Revenue $ 37,903 $ 28,162 $ 105,906 $ 77,576
Costs and operating expenses:        
Cost of revenue (exclusive of depreciation and amortization) 14,053 11,645 40,747 33,387
Sales and marketing 7,257 6,979 21,556 22,097
Research and product development 4,367 3,464 11,998 9,531
General and administrative 5,405 4,642 15,310 12,580
Depreciation and amortization 3,237 2,636 9,347 7,112
Total costs and operating expenses 34,319 29,366 98,958 84,707
Income (loss) from operations 3,584 (1,204) 6,948 (7,131)
Other expense, net (5) (12) (93) (34)
Interest income, net 155 102 377 221
Income (loss) before provision for income taxes 3,734 (1,114) 7,232 (6,944)
Provision for income taxes 52 11 93 48
Net income (loss) $ 3,682 $ (1,125) $ 7,139 $ (6,992)
Net income (loss) per common share:        
Net income (loss) per share, basic (usd per share) $ 0.11 $ (0.03) $ 0.21 $ (0.21)
Net income (loss) per share, diluted (usd per share) $ 0.10 $ (0.03) $ 0.20 $ (0.21)
Weighted average common shares outstanding:        
Weighted average number of shares used to compute basic net income (loss) per share (in shares) 33,905 33,600 33,817 33,529
Weighted average number of shares used to compute diluted net income (loss) per share (in shares) 35,205 33,600 35,091 33,529