Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Revenue		$ 52,969	$ 31,416
Cost of revenue	[1]	15,168	8,151
Amortization of acquired technology		765
Gross profit		37,036	23,265
Operating expenses:
Selling and marketing	[1]	21,606	12,949
Product development	[1]	2,923	2,032
General and administrative	[1]	6,435	3,355
Depreciation, excluding depreciation of $381 and $171, respectively, included in cost of revenue		1,221	1,186
Amortization		1,630	159
Total operating expenses		33,815	19,681
Operating income		3,221	3,584
Interest and other income (expense), net		(696)	(469)
Income before provision for income taxes		2,525	3,115
Provision for income taxes		715	908
Net income		1,810	2,207
Other comprehensive income (loss), net of tax:
Unrealized income (loss) on investments (net of tax provision of $0 and $37, respectively)			(132)
Foreign currency translation gain (loss)		1,034	(53)
Other comprehensive income (loss)		1,034	(185)
Comprehensive income		$ 2,844	$ 2,022
Net income per common share:
Basic		$ 0.06	$ 0.08
Diluted		$ 0.06	$ 0.08
Weighted average common shares outstanding:
Basic		28,141,000	28,004,000
Diluted		29,242,347	28,439,719

[1] Amounts include stock-based compensation expense as follows: