Accounts Receivable, Net - Schedule of Changes in the Allowance for Doubtful Accounts on Accounts Receivable (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ (14,894)	$ (14,379)
Provision	(4,450)	(9,323)
Charge-offs, net of recoveries	4,986	8,808
Allowance for doubtful accounts	$ (14,358)	$ (14,894)