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Income Taxes - Income Tax Benefit Attributable to Our Loss from Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |
U.S. federal income tax benefit at statutory rates | $ (2,047) | $ (1,151)
State income tax benefit, net of federal benefit | (350) | (201)
Change in state tax rate | 110 |
Research and experimentation credits | (191) | (31)
Deferred tax asset adjustment | 3 | 3
Other | 103 | 115
Change in valuation allowance | 2,363 | 1,098
Income tax benefit | $ (9) | $ (167)

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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 increase (decrease) in the valuation allowance for deferred tax assets. + 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=84230637&loc=d3e32687-109319 + Details
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