CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenues	$ 30,825	$ 30,884
Cost of revenues	2,946	3,385
Gross profit	27,879	27,499
Operating expenses:
Sales and marketing	15,606	15,542
Product development	1,703	2,511
General and administrative	5,599	5,789
Total operating expenses	22,908	23,842
Income from operations	4,971	3,657
Other income (expense), net	(99)	161
Income before income taxes	4,872	3,818
Income tax expense	1,752	1,316
Net income	$ 3,120	$ 2,502
Net income per share - basic (in dollars per share)	$ 0.26	$ 0.20
Net income per share - diluted (in dollars per share)	$ 0.26	$ 0.20
Shares used in computing basic net income (loss) per share (in shares)	11,914	12,462
Shares used in computing diluted net income (loss) per share (in shares)	12,224	12,462