Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Revenue	$ 75,414	$ 69,588	$ 219,088	$ 204,869
Cost of revenue	19,401	19,304	59,007	57,189
Gross profit	56,013	50,284	160,081	147,680
Operating expenses:
Sales and marketing	32,897	29,496	96,236	91,666
General and administrative	15,614	18,652	50,795	55,406
Product development	6,858	6,859	20,828	19,107
Total operating expenses	55,369	55,007	167,859	166,179
Income (loss) from operations	644	(4,723)	(7,778)	(18,499)
Interest expense	1,165	1,124	3,415	3,323
Amortization of debt issuance costs	143	143	429	429
Other (income) expense, net	(133)	151	979	989
Net loss before income tax	(531)	(6,141)	(12,601)	(23,240)
Income tax expense	700	420	1,474	1,164
Net loss before income tax	$ (1,231)	$ (6,561)	$ (14,075)	$ (24,404)
Net loss per common share:
Basic (in dollars per share)	$ (0.02)	$ (0.11)	$ (0.25)	$ (0.43)
Diluted (in dollars per share)	$ (0.02)	$ (0.11)	$ (0.25)	$ (0.43)
Weighted average number of shares:
Basic (in shares)	56,916,485	57,446,774	57,303,394	56,970,515
Diluted (in shares)	56,916,485	57,446,774	57,303,394	56,970,515