Accounts Receivable - Credit Loss (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($)
Receivables [Abstract]
Beginning balance of the allowance for credit losses	$ (3,888)
Current period provision for expected credit losses, net of recoveries	33
Charge-offs of amounts previously written off	371
Ending balance of the allowance for credit losses	$ (3,484)