Basis of Presentation - Allowance for Credit Losses (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($)
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 1,497
Provision for credit losses during the period	282
Write-off during the period	(1,562)
Ending balance	$ 217