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Income Taxes - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating Loss Carryforwards [Line Items] |  |  |
Federal provision for income taxes | $ 0 | $ 0 |
State provision for income taxes | 0 | 0 |
Provision for income taxes | 0 | 0 | $ 0
Deferred tax assets | 51,832,000 | 16,464,000 |
Valuation allowance increased | 35,300,000 |  |
U.S federal net operating loss carryforwards | 144,500,000 |  |
State net operating loss carryforwards | 123,400,000 |  |
Operating loss carryforwards | $ 141,300,000 |  |
Carryforwards expiration year | 2036 |  |
Statutory federal income tax rate | 21.00% |  |
Increase or decrease in unrecognized tax benefits | $ 0 | 0 |
Unrecognized tax benefits that would affect effective tax rate | $ 0 | $ 0 |
Federal |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Carryforwards expiration year | 2036 |  |
Research and development tax credit carryforwards | $ 6,100,000 |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32621-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32632-109319 + Details
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