Segment Information - Reconciliation of Segment Measure to Income (Loss) Before (Expense) Benefit from Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting [Abstract]
Total	$ 21,487	$ 16,706	$ 59,249	$ 36,157
Interest expense, net	(1,722)	(3,043)	(11,208)	(10,896)
Income tax (expense) benefit	(902)	(3,348)	(648)	1,563
Depreciation and amortization	(11,471)	(9,740)	(33,145)	(27,084)
Stock-based compensation	(2,365)	(1,149)	(6,587)	(3,439)
Start-up losses and investment in new services	(1,186)	(602)	(3,276)	(1,283)
Acquisition costs	(913)	(6)	(1,656)	(3,767)
Fair value changes in financial instruments	(531)	(9,710)	(1,651)	(17,492)
Fair value changes in business acquisitions contingent consideration		(13,404)	(24,035)	(17,387)
Short term purchase accounting fair value adjustment to deferred revenue				(243)
Initial public offering expense and related bonuses		(6,378)		(6,908)
Discontinued services		(30)		(7,526)
Expenses related to financing transactions			(50)	(277)
Other losses or expenses	(171)	(33)	(846)	(179)
Net income (loss)	$ 2,226	$ (30,737)	$ (23,853)	$ (58,761)