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, 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
Foreign currency translation gain (loss)	(43)
Balance, Ending at Jun. 30, 2022	255,293				$ 6	$ 2	$ 1		769,977	(512,140)	(2,553)
Balance, Ending, Shares at Jun. 30, 2022					61,465,531	14,127,613	9,352,729
Balance, Beginning at Mar. 31, 2022	251,755				$ 6	$ 2	$ 1		773,613	(520,607)	(1,260)
Balance, Beginning, Shares at Mar. 31, 2022					62,083,381	14,127,613	9,352,729
Tax payments related to shares withheld for share-based compensation plans	(10)								(10)
Tax payments related to shares withheld for share-based compensation plans, shares					20,681
Stock-based compensation expense	2,636								2,636
Repurchase of Class A common stock	(4,138)								(4,138)
Repurchase of Class A common stock, shares					(638,531)			638,531
Retirement of treasury stock, shares								(638,531)
Dividends paid	(2,124)								(2,124)
Change in fair value of marketable securities	(1,250)										(1,250)
Foreign currency translation gain (loss)	(43)										(43)
Net income (loss) attributable to common stockholders	8,467									8,467
Balance, Ending at Jun. 30, 2022	255,293				$ 6	$ 2	$ 1		769,977	(512,140)	(2,553)
Balance, Ending, Shares at Jun. 30, 2022					61,465,531	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
Dividends paid	(4,386)								(4,386)
Distributions to noncontrolling interest	(546)											(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		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
Repurchase of Class A common stock		$ (11,300)
Repurchase of Class A common stock, shares		0
Foreign currency translation gain (loss)	(55)
Balance, Ending at Jun. 30, 2023	233,919				$ 8		$ 1		739,571	(504,323)	(1,338)
Balance, Ending, Shares at Jun. 30, 2023		78,617,017	0	9,352,729	78,617,017		9,352,729
Balance, Beginning at Mar. 31, 2023	286,564				$ 8		$ 1		776,198	(502,334)	(1,368)	14,059
Balance, Beginning, Shares at Mar. 31, 2023					78,356,490		9,352,729
Issuance of common stock upon exercise of stock options or awards of restricted stock units	241								241
Issuance of common stock upon exercise of stock options or awards of restricted stock units, Shares					260,527
Tax payments related to shares withheld for share-based compensation plans	(15)								(15)
Stock-based compensation expense	5,968								5,968
Repurchase of Class A common stock, shares		0
Dividends paid	(4,396)								(4,396)
Distributions to noncontrolling interest	(3,810)											(3,810)
Change in fair value of marketable securities	79										79
OCI release due to realized gain (loss) on marketable securities.	22										22
Foreign currency translation gain (loss)	(71)										(71)
Acquisition of noncontrolling interest	(1,374)								(750)			(624)
Accounting for Adsmurai transaction	(47,300)								(37,675)			$ (9,625)
Net income (loss) attributable to common stockholders	(1,989)									(1,989)
Balance, Ending at Jun. 30, 2023	$ 233,919				$ 8		$ 1		$ 739,571	$ (504,323)	$ (1,338)
Balance, Ending, Shares at Jun. 30, 2023		78,617,017	0	9,352,729	78,617,017		9,352,729