Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock Class A	Common Stock Class B	Additional paid in capital.	Retained Earnings ASC 842	Retained Earnings	Accumulated Other Comprehensive Loss	Class A	Class B	ASC 842	Total
Balance at Dec. 31, 2020	$ 26	$ 120	$ 206,541	$ 508	$ 25,782	$ (3,127)			$ 508	$ 229,342
Balance (in shares) at Dec. 31, 2020	26,327	120,117
Exercise of stock options, net	$ 1		(6,998)							(6,997)
Exercise of stock options, net (in shares)	640
Shares issued upon vesting of Restricted Stock Units, net			(34)							(34)
Shares issued upon vesting of Restricted Stock Units, net (in shares)	5
Stock-based compensation expense			6,302							6,302
Foreign currency translation adjustments and revaluations, net of tax						(977)				(977)
Net (loss) income					2,288					2,288
Balance at Mar. 31, 2021	$ 27	$ 120	205,811		28,578	(4,104)				230,432
Balance (in shares) at Mar. 31, 2021	26,972	120,117
Balance at Dec. 31, 2020	$ 26	$ 120	206,541	$ 508	25,782	(3,127)			$ 508	229,342
Balance (in shares) at Dec. 31, 2020	26,327	120,117
Exercise of stock options, net (in shares)							1,727
Shares issued upon vesting of Restricted Stock Units, net (in shares)							8
Foreign currency translation adjustments and revaluations, net of tax										(10,040)
Net (loss) income										(852)
Balance at Sep. 30, 2021	$ 41	$ 108	215,647		25,438	(13,167)				228,067
Balance (in shares) at Sep. 30, 2021	40,574	108,017
Balance at Mar. 31, 2021	$ 27	$ 120	205,811		28,578	(4,104)				230,432
Balance (in shares) at Mar. 31, 2021	26,972	120,117
Exercise of stock options, net	$ 1		(3,293)							(3,292)
Exercise of stock options, net (in shares)	462
Shares issued upon vesting of Restricted Stock Units, net (in shares)	234
Stock-based compensation expense			1,010							1,010
Shares issued in connection with ESPP			6,101							6,101
Shares issued in connection with ESPP (shares)	60
Class B shares exchanged for Class A shares	$ 12	$ (12)
Class B shares exchanged for Class A shares (in shares)	12,100	(12,100)
Foreign currency translation adjustments and revaluations, net of tax						(3,359)				(3,359)
Net (loss) income					808					808
Balance at Jun. 30, 2021	$ 40	$ 108	209,629		29,386	(7,463)				231,700
Balance (in shares) at Jun. 30, 2021	39,828	108,017
Exercise of stock options, net	$ 1		(919)							(918)
Exercise of stock options, net (in shares)	625						625
Shares issued upon vesting of Restricted Stock Units, net			(44)							(44)
Shares issued upon vesting of Restricted Stock Units, net (in shares)	3						3
Shares issued upon vesting of Restricted Stock Awards, net			(213)							(213)
Shares issued upon vesting of Restricted Stock Awards, net (in shares)	118
Stock-based compensation expense			7,194							7,194
Foreign currency translation adjustments and revaluations, net of tax						(5,704)				(5,704)
Net (loss) income					(3,948)					(3,948)
Balance at Sep. 30, 2021	$ 41	$ 108	215,647		25,438	(13,167)				228,067
Balance (in shares) at Sep. 30, 2021	40,574	108,017
Balance at Dec. 31, 2021	$ 42	$ 107	222,621		24,811	(17,497)				230,084
Balance (in shares) at Dec. 31, 2021	42,286	106,807					42,286	106,807
Exercise of stock options, net			278							278
Exercise of stock options, net (in shares)	272
Shares issued upon vesting of Restricted Stock Units, net			(15)							(15)
Shares issued upon vesting of Restricted Stock Units, net (in shares)	3
Stock-based compensation expense			4,867							4,867
Foreign currency translation adjustments and revaluations, net of tax						(2,049)				(2,049)
Net (loss) income					(334)					(334)
Balance at Mar. 31, 2022	$ 42	$ 107	227,751		24,477	(19,546)				232,831
Balance (in shares) at Mar. 31, 2022	42,561	106,807
Balance at Dec. 31, 2021	$ 42	$ 107	222,621		24,811	(17,497)				230,084
Balance (in shares) at Dec. 31, 2021	42,286	106,807					42,286	106,807
Exercise of stock options, net (in shares)							577
Foreign currency translation adjustments and revaluations, net of tax										(24,496)
Unrealized gain (loss) from available-for-sale investments, net of tax										(26)
Net (loss) income										(6,995)
Balance at Sep. 30, 2022	$ 49	$ 101	238,093		17,816	(42,019)				214,040
Balance (in shares) at Sep. 30, 2022	48,673	101,307					48,673	101,307
Balance at Mar. 31, 2022	$ 42	$ 107	227,751		24,477	(19,546)				232,831
Balance (in shares) at Mar. 31, 2022	42,561	106,807
Exercise of stock options, net			(34)							(34)
Exercise of stock options, net (in shares)	93
Shares issued upon vesting of Restricted Stock Units, net (in shares)	59
Stock-based compensation expense			4,166							4,166
Shares issued in connection with ESPP			967							967
Shares issued in connection with ESPP (shares)	103
Class B shares exchanged for Class A shares	$ 6	$ (6)
Class B shares exchanged for Class A shares (in shares)	5,500	(5,500)
Foreign currency translation adjustments and revaluations, net of tax						(11,777)				(11,777)
Unrealized gain (loss) from available-for-sale investments, net of tax						2				2
Net (loss) income					(5,520)					(5,520)
Balance at Jun. 30, 2022	$ 48	$ 101	232,850		18,957	(31,321)				220,635
Balance (in shares) at Jun. 30, 2022	48,316	101,307
Exercise of stock options, net	$ 1		387							388
Exercise of stock options, net (in shares)	212						212
Shares issued upon vesting of Restricted Stock Units, net			(176)							(176)
Shares issued upon vesting of Restricted Stock Units, net (in shares)	31
Shares issued upon vesting of Restricted Stock Awards, net			(164)							(164)
Shares issued upon vesting of Restricted Stock Awards, net (in shares)	114
Stock-based compensation expense			5,196							5,196
Foreign currency translation adjustments and revaluations, net of tax						(10,670)				(10,670)
Unrealized gain (loss) from available-for-sale investments, net of tax						(28)				(28)
Net (loss) income					(1,141)					(1,141)
Balance at Sep. 30, 2022	$ 49	$ 101	$ 238,093		$ 17,816	$ (42,019)				$ 214,040
Balance (in shares) at Sep. 30, 2022	48,673	101,307					48,673	101,307