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Income Taxes - Effective Income Tax Reconciliation (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Amount [Abstract]    
U.S. Federal benefit at statutory rate $ (3,993,000) $ (4,064,000)
State and local (benefit) / expense net of U.S. federal tax 0 0
Permanent non deductible expenses for U.S. taxes 5,000 14,000
AMT credit benefit 0 0
Change in state deferred 5,122,000 (4,720,000)
Return to actual 0 (17,000)
Other true ups 387,000 1,941,000
Effect of change in deferred tax rate 0 0
Sale of New Jersey State NOL's (10,872,000) 0
Valuation allowance for deferred tax assets (1,521,000) 6,846,000
Tax provision (benefit) $ (10,872,000) $ 0