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Leases - Supplemental balance sheet information (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Leases    
Operating lease – right of use assets, net $ 1,936 $ 2,459
Current portion of operating lease liabilities, included in accrued liabilities 579 577
Operating lease liabilities, net of current portion 1,489 2,021
Total operating lease liabilities $ 2,068 $ 2,598
Weighted average remaining lease term for operating leases (in years) 3 years 6 months 14 days 4 years 5 months 5 days
Weighted average discount rate for operating leases 6.10% 6.10%