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Leases - Schedule of Operating Lease Right-of-use Assets and Liabilities (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Leases [Abstract]        
Operating lease right-of-use assets $ 2,101  
Amortization of operating lease right-of-use assets (161) (217) (291)
Addition of operating lease right-of -use asset 28      
Write-off of right-of-use asset due to headquarters lease termination (1,913)      
Write-off of right-of-use asset related to other lease terminations (50)      
Operating lease right-of-use assets 5   2,101
Operating lease liabilities, Beginning 3,300 $ 3,458 3,458  
Principal payments on operating lease liabilities (154)      
Addition of operating lease liability 28      
Write-off of lease liability related to headquarters lease termination (3,135)      
Write-off of lease liability related to other lease terminations (34)      
Operating lease liabilities, Ending 5   3,300 3,458
Less non-current portion   (2,891)
Current portion $ 5   $ 409