Contingencies - Additional Information (Details) - USD ($)	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Commitments And Contingencies [Line Items]
Estimated exposure of guarantees	$ 1,700,000	$ 2,400,000
Guarantees accrued	0	0
Outstanding Letters of Credits	$ 1,400,000	$ 1,400,000
Minimum
Commitments And Contingencies [Line Items]
Term of guarantees	2 years
Maximum
Commitments And Contingencies [Line Items]
Term of guarantees	6 years