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Commitments and Contingencies - Leases, Maturities of operating leases (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Commitments and Contingencies  
2020 $ 879
2021 777
2022 443
Present value adjustment (208)
Total lease liabilities 1,891
Less: current lease liabilities (640)
Long term lease liabilities $ 1,251
Maximum days allowed for cancellation of contracts prior written notice 90 days