Leases - Additional Lease Information (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Right-of-use assets and lease liabilities
Right-of-use assets	$ 13,580	$ 2,274
Current portion of lease liabilities	3,391	2,117
Operating lease liability, net of current portion	10,669	$ 413
Total operating lease liabilities	$ 14,060
Additional details
Weighted-average remaining life (years)	3 years 8 months 12 days
Weighted-average discount rate	6.86%