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Income Taxes - Effective Income Tax Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Amount [Abstract]    
U.S. Federal benefit at statutory rate $ (4,064) $ (3,395)
State and local (benefit) / expense net of U.S. federal tax 0 0
Permanent non deductible expenses for U.S. taxes 14 11
AMT credit benefit 0 0
Change in state deferred (4,720) 2,799
Return to actual (17) (177)
Other true ups 1,941 (1,949)
Effect of change in deferred tax rate 0 0
Valuation allowance for deferred tax assets 6,846 2,711
Tax provision benefit $ 0 $ 0