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Income Taxes - Summary of Significant Components of Net Deferred Income Tax Assets and Liabilities (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
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Current deferred income tax assets: |  |
Accrued compensation and other | $ 11,000 | $ 11,000
Less: valuation allowance | (11,000) | (11,000)
Current deferred income tax assets | 0 | 0
Non-current deferred income tax assets and (liabilities): |  |
Net operating loss | 13,013,000 | 12,003,000
Research and development credit | 18,000 | 18,000
Warrants issued for services | 45,000 | 45,000
Depreciation and amortization | 126,000 | 95,000
Exercise of options and warrants | (33,000) | (33,000)
Stock based compensation | 1,028,000 | 957,000
Intangibles and other | (606,000) | (471,000)
Less: valuation allowance | (13,591,000) | (12,614,000)
Net non-current deferred tax assets | $ 0 | $ 0

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