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Leases - Supplemental Balance Sheet Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Leases    
Operating lease right-of-use assets $ 1,690 $ 1,936
Operating lease liabilities:    
Current portion of operating lease liabilities, included in accrued liabilities 625 579
Operating lease liabilities, net of current portion 1,181 1,489
Total operating lease liabilities $ 1,806 $ 2,068
Weighted average remaining lease term for operating leases (in years) 2 years 10 months 13 days 3 years 6 months 14 days
Weighted average discount rate for operating leases 5.90% 6.10%