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Income Taxes (Details 3) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Current State and Local Tax Expense (Benefit) | $ (269) | $ 445 | $ (809)
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount | 1,777 | 1,688 | 1,059
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Research and Development, Amount | 0 | 0 | (978)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount | (20,418) | (35,276) | 25,928
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount | (12,300) | 26,065 | (25,315)
Write-off of tax credits | 31,053 |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | 157 | 1,064 | 115
Income Tax Benefit | $ 0 | $ (6,014) | $ 0
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent | 21.00% |  |

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