Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues:
Total revenues		$ 121,333	$ 108,556	$ 106,625
Cost of revenues:
Total cost of revenues		28,959	28,336	30,217
Gross profit		92,374	80,220	76,408
Operating expenses:
Selling and marketing	[1]	47,779	44,747	44,316
Product development	[1]	8,869	8,215	8,038
General and administrative	[1]	14,557	12,212	12,370
Depreciation and amortization		4,548	4,636	4,893
Total operating expenses		75,753	69,810	69,617
Operating income		16,621	10,410	6,791
Interest and other expense, net		(1,778)	(693)	(1,774)
Income before provision for income taxes		14,843	9,717	5,017
Provision for income taxes		1,888	2,914	2,598
Net income		12,955	6,803	2,419
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on investments (net of tax (provision) benefit of $(11), $(7), and $6, respectively)		15	13	(10)
Foreign currency translation adjustments		(295)	300	84
Other comprehensive income (loss)		(280)	313	74
Comprehensive income		$ 12,675	$ 7,116	$ 2,493
Net income per common share:
Basic		$ 0.47	$ 0.25	$ 0.08
Diluted		$ 0.45	$ 0.24	$ 0.08
Weighted average common shares outstanding:
Basic		27,738,178	27,550,044	29,953,798
Diluted		28,652,814	28,271,384	30,773,532
Online [Member]
Revenues:
Total revenues		$ 121,333	$ 108,388	$ 101,827
Cost of revenues:
Total cost of revenues	[1]	$ 28,959	28,295	27,545
Events [Member]
Revenues:
Total revenues			168	4,798
Cost of revenues:
Total cost of revenues			$ 41	$ 2,672

[1] Amounts include stock-based compensation expense as follows: Cost of online revenues 159 $43 $112 Selling and marketing 4,899 $4,120 $4,119 Product development 200 $112 $159 General and administrative 3,855 $2,637 $2,462