Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Operating leases:
ROU assets	$ 22,706	$ 29,798
Operating lease liabilities	9,503	10,797
Operating lease liabilities, net of current portion	18,931	25,975
Total operating lease liabilities	28,434	36,772
Finance leases:
Property and equipment	2,861	2,880
Accumulated depreciation	(2,318)	(1,963)
Property and equipment, net	543	917
Other current liabilities	186	608
Other long-term liabilities	0	63
Total finance lease liabilities	$ 186	$ 671
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property and equipment, net	Property and equipment, net
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other current liabilities	Other current liabilities
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other long-term liabilities	Other long-term liabilities