Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Revenues, net	$ 54,793	$ 52,145	$ 108,871	$ 99,301
Operating costs and expenses:
Cost of revenues (excluding depreciation and amortization)	22,622	22,432	45,522	42,625
Product development	7,244	5,815	14,263	10,460
Sales and marketing	9,001	10,328	17,558	17,675
Other general and administrative expenses	8,529	6,750	16,505	13,678
Depreciation and amortization	5,081	4,256	10,221	7,509
Total operating costs and expenses	52,477	49,581	104,069	91,947
Operating income	2,316	2,564	4,802	7,354
Other income (expense), net	109	(44)	127	(35)
Income before income tax provision	2,425	2,520	4,929	7,319
Income tax provision	1,022	1,047	2,026	3,124
Net income	$ 1,403	$ 1,473	$ 2,903	$ 4,195
Earnings per share:
Basic	$ 0.04	$ 0.05	$ 0.09	$ 0.15
Diluted	$ 0.04	$ 0.05	$ 0.09	$ 0.15
Weighted average shares of common stock outstanding:
Basic	31,736	29,234	31,701	28,469
Diluted	32,071	29,617	32,021	28,843