Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenues		$ 31,416	$ 29,972
Cost of revenues	[1]	8,151	7,012
Gross profit		23,265	22,960
Operating expenses:
Selling and marketing	[1]	12,949	12,446
Product development	[1]	2,032	1,987
General and administrative	[1]	3,355	3,022
Depreciation and amortization, excluding depreciation of $171, $13, included in cost of revenues		1,345	1,130
Total operating expenses		19,681	18,585
Operating income		3,584	4,375
Interest and other expense, net		(469)	(137)
Income before provision for income taxes		3,115	4,238
Provision for income taxes		908	948
Net income		2,207	3,290
Other comprehensive (loss) income, net of tax:
Unrealized loss on investments (net of tax provision of $37, $0)		(132)
Foreign currency translation (loss) gain		(53)	41
Other comprehensive (loss) gain		(185)	41
Comprehensive income		$ 2,022	$ 3,331
Net income per common share:
Basic		$ 0.08	$ 0.12
Diluted		$ 0.08	$ 0.12
Weighted average common shares outstanding:
Basic		28,004	27,805
Diluted		28,440	28,206

[1] Amounts include stock-based compensation expense as follows:  Cost of revenues $68 $40 Selling and marketing 2,188 1,691 Product development 196 92 General and administrative 976 639