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Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Provision for income taxes [Abstract] |  |
Income taxes using U.S federal statutory rate | $ (5,386) | $ (5,073)
Nondeductible interest | 39 | 315
Loss of tax benefit of state net operating loss carryforwards | 2,799 | (11)
Branch income | 229 | (238)
State income taxes, net of federal benefit | 311 | (1,788)
Foreign rate differential | 27 | (238)
Valuation allowance | 2,114 | 6,281
Derivative charge |  | 595
Stock option expense, exercises and cancellations | 446 | 308
Research and development costs | (375) | (166)
Other | (204) | 15
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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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax expense (benefit). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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