Revenues and Accounts Receivable - Schedule of Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended		12 Months Ended
	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Revenues And Accounts Receivable [Abstract]
Beginning Balance	$ 1,327	$ 4,265	$ 1,327	$ 1,327
Bad Debt Expense	$ 6,300	803	$ 6,445	4,532
Charged to Allowance		(1,229)		(2,633)
Other		540		1,039
Ending Balance		$ 4,379		$ 4,265