Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Assets
Right-of-use assets	$ 15,269	$ 17,076
Finance lease	377	467
Total leased assets	$ 15,646	$ 17,543
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property and equipment, net	Property and equipment, net
Operating lease liabilities
Operating lease liabilities, current	$ 2,394	$ 2,260
Operating lease liabilities, non-current	14,117	15,950
Present value of lease liabilities	16,511	18,210
Finance lease liabilities
Finance lease liabilities, current	497	370
Finance lease liabilities, non-current	333	242
Total Finance lease liabilities	$ 830	$ 612
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued liabilities		Accrued liabilities
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other long-term liabilities		Other long-term liabilities