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Leases - Schedule of Financing Lease Right-of-use Assets and Liabilities (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Leases [Abstract]        
Finance lease right-of use assets $ 41 $ 80 $ 80  
Depreciation of finance lease right-of-use assets (10)   (39)  
Finance lease right-of use assets 31   41 $ 80
Finance lease liabilities 41 86 86  
Principal payments on finance lease liabilities as of June 30, 2020 (8) $ (30) (45) (249)
Finance lease liabilities 33   41 86
Less non-current portion 9   20 41
Current portion at June 30, 2020 $ (24)   $ (21) $ (45)