Restatement of Previously Issued Financial Statements - Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Contingent earnout share liability	$ 33,069	$ 35,684	$ 32,086	$ 24,912	$ 61,478
Total long-term liabilities	379,967	389,701	441,856	443,817	430,324
Common stock	9				8
Additional paid-in capital	171,073	157,045	76,251	74,565	54,346
Accumulated deficit	(43,291)	(34,771)	(43,314)	(14,866)	(30,307)
Total stockholders' equity	$ 127,884	122,283	32,945	59,707	24,047	$ 57,118	$ 44,534
Class A-2 Common Stock
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Common stock		0	0	0	0
Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Contingent earnout share liability		0	0	0	0
Total long-term liabilities		354,017	409,770	418,905	368,846
Additional paid-in capital		189,524	108,732	107,046	105,986
Accumulated deficit		(31,567)	(43,710)	(22,436)	(20,470)
Total stockholders' equity		157,967	65,031	84,619	85,525
Previously Reported | Class A-2 Common Stock
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Common stock		$ 1	$ 1	$ 1	$ 1