Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue	$ 72,495	$ 57,091
Costs and operating expenses:
Cost of revenue (exclusive of depreciation and amortization)	28,961	24,181
Sales and marketing	14,506	11,219
Research and product development	11,212	8,481
General and administrative	8,572	8,192
Depreciation and amortization	6,414	5,076
Total costs and operating expenses	69,665	57,149
Income (loss) from operations	2,830	(58)
Other income (expense), net	22	(1)
Interest expense, net	(494)	(497)
Income (loss) before provision for (benefit from) income taxes	2,358	(556)
Provision for (benefit from) income taxes	375	(4,281)
Net income	$ 1,983	$ 3,725
Net income per common share:
Basic (in dollars per share)	$ 0.06	$ 0.11
Diluted (in dollars per share)	$ 0.06	$ 0.11
Weighted average common shares outstanding:
Basic (in shares)	34,175	33,913
Diluted (in shares)	35,681	35,342