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Commitments and Contingencies - Leases, Maturities of operating leases (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Commitments and Contingencies    
2020 $ 743  
2021 751  
2022 443  
Present value adjustment (245)  
Total lease liabilities 1,692  
Less: current lease liabilities (636) $ (640)
Long term lease liabilities $ 1,056 $ 1,251
Maximum days allowed for cancellation of contracts prior written notice 90 days