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Income Taxes - Reconciliation of Effective Tax Rate (Details) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | [1] | Dec. 31, 2019 | [1]
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Abstract] |  |  |
Statutory Rate | 21.00% | 21.00% | 21.00%
Stock-based Compensation | 2.20% | 0.80% | (0.40%)
Credits | 1.10% | 0.60% | (0.50%)
Change in Fair Value of Tranche Liability | 0.00% | 0.00% | 1.30%
Change in valuation allowance | (23.00%) | (22.10%) | (21.80%)
Section 162(m) Limitation | (1.10%) | (0.10%) | 0.00%
Other | (0.20%) | (0.20%) | 0.40%
Total | 0.00% | 0.00% | 0.00%
[1] | The 2019 and 2020 effective tax rate reconciliations have been updated to conform to the 2021 presentation.

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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- Definition Percentage 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 changes 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 S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 Reference 2: 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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