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Income Taxes - Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |
Statutory tax rate | 21.00% | 21.00% | 21.00%
Valuation allowance | $ 130,569,000 | $ 69,222,000 |
Operating Loss Carryforwards [Line Items] |  |  |
Interest and penalties accrued | 0 | 0 |
Unrecognized tax benefits that would impact effective tax rate, if recognized | 0 |  |
United States |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards | 469,600,000 |  |
Net operating loss carryforwards, not subject to expiration | 426,900,000 |  |
Net operating loss carryforwards, subject to expiration | 42,700,000 |  |
United States | Research Tax Credit Carryforward |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Research and development tax credit carryforwards | 10,500,000 | $ 8,000,000 |
U.S. State |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards | $ 420,600,000 |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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