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Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Provision for income taxes [Abstract] |  |
Income taxes using U.S federal statutory rate | $ (5,073) | $ (1,865)
Nondeductible interest | 315 | 994
Loss on extinguishment of debt |  | 361
Loss of tax benefit of state net operating loss carryforwards | (11) | 1,477
Loss of tax benefit of federal tax credit carryforwards |  | 324
Branch income | (238) |
State income taxes, net of federal benefit | (1,788) | (1,461)
Foreign rate differential | (238) | 664
Valuation allowance | 6,281 | 3,512
Derivative charge | 595 | (3,674)
Stock option exercises and cancellations | 308 |
Research and development costs | (166) | (316)
Other | 15 | (16)
Total | $ 0 | $ 0

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- Definition The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to derivative costs. + References No definition available. + Details
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