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Leases - Schedule of Operating Lease Right-of-use Assets and Liabilities (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Leases [Abstract]        
Operating lease right-of-use assets $ 2,101,000  
Amortization of operating lease right-of-use assets (146,000) (144,000) (291,000)
Addition of operating lease right-of -use asset 28,000      
Write-off of right-of-use asset related to asset sale (26,000)      
Write-off of right-of-use asset due to lease termination (1,913,000)      
Operating lease right-of-use assets 44,000   2,101,000
Operating lease liabilities, Beginning 3,300,000 $ 3,458,000 3,458,000  
Principal payments on operating lease liabilities (120,000)      
Addition of operating lease liability 28,000      
Write-off of lease liability related to January 2020 asset sale (27,000)      
Write-off of lease liability related to lease termination (3,135,000)      
Operating lease liabilities, Ending 46,000   3,300,000 3,458,000
Less non-current portion (18,000)   (2,891,000)
Current portion $ 28,000   $ 409,000