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Leases - Other supplemental balance sheet information related to leases (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Operating Leases:    
Operating lease right of use assets $ 2,754,000 $ 4,484,000
Current operating lease liabilities $ (1,023,000) $ (1,304,000)
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Other Accrued Liabilities, Current Other Accrued Liabilities, Current
Noncurrent operating lease liabilities $ (1,670,000) $ (3,119,000)
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other non-current liabilities Other non-current liabilities
Total operating lease liabilities $ 2,693,000 $ 4,423,000
Weighted average remaining lease term (in years), Operating leases 3 years 6 months 4 years
Weighted average discount rate, Operating leases 5.90% 4.90%