Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Class A common stock	Class B common stock	Class U common stock	Common Stock Class A common stock	Common Stock Class B common stock	Common Stock Class U common stock	Treasury Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest
Balance, Beginning at Dec. 31, 2021	$ 256,926				$ 6	$ 2	$ 1		$ 780,388	$ (522,494)	$ (977)
Balance, Beginning, Shares at Dec. 31, 2021					63,116,896	14,127,613	9,352,729
Issuance of common stock upon exercise of stock options or awards of restricted stock units	218								218
Issuance of common stock upon exercise of stock options or awards of restricted stock units, Shares					66,000
Tax payments related to shares withheld for share-based compensation plans	(257)								(257)
Tax payments related to shares withheld for share-based compensation plans, shares					14,955
Stock-based compensation expense	2,573								2,573
Repurchase of Class A common stock	(7,142)								(7,142)
Repurchase of Class A common stock, shares					(1,114,470)			1,114,470
Retirement of treasury stock, shares								(1,114,470)
Dividends paid	(2,167)								(2,167)
Change in fair value of marketable securities	(283)										(283)
Net income (loss) attributable to common stockholders	1,887									1,887
Balance, Ending at Mar. 31, 2022	251,755				$ 6	$ 2	$ 1		773,613	(520,607)	(1,260)
Balance, Ending, Shares at Mar. 31, 2022					62,083,381	14,127,613	9,352,729
Balance, Beginning at Dec. 31, 2022	285,369				$ 8		$ 1		776,298	(504,375)	(1,510)	$ 14,947
Balance, Beginning, Shares at Dec. 31, 2022		78,172,827	0	9,352,729	78,172,827		9,352,729
Issuance of common stock upon exercise of stock options or awards of restricted stock units	313								313
Issuance of common stock upon exercise of stock options or awards of restricted stock units, Shares					164,474
Tax payments related to shares withheld for share-based compensation plans	(80)								(80)
Tax payments related to shares withheld for share-based compensation plans, shares					19,189
Stock-based compensation expense	4,053								4,053
Repurchase of Class A common stock		$ (11,300)
Repurchase of Class A common stock, shares		0
Dividends paid	(4,932)								(4,386)			(546)
Change in fair value of marketable securities	103										103
OCI release due to realized gain (loss) on marketable securities.	23										23
Foreign currency translation gain (loss)	16										16
Net income (loss) attributable to common stockholders	1,699									2,041		(342)
Balance, Ending at Mar. 31, 2023	$ 286,564				$ 8		$ 1		$ 776,198	$ (502,334)	$ (1,368)	$ 14,059
Balance, Ending, Shares at Mar. 31, 2023		78,356,490	0	9,352,729	78,356,490		9,352,729