Income Tax - Summary of Components of Income Tax Expense Benefit (Detail) - USD ($) |
9 Months Ended | 12 Months Ended | ||||
|---|---|---|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Sep. 30, 2021 |
Sep. 30, 2020 |
Dec. 31, 2020 |
Dec. 31, 2019 |
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| Currently reportable expense | ||||||
| Federal | $ 0 | $ 0 | ||||
| State | 0 | 0 | ||||
| Total | 0 | 0 | ||||
| Deferred benefit: | ||||||
| Federal | 1,841,000 | 288,000 | ||||
| State | 591,000 | 92,000 | ||||
| Total | 2,432,000 | 380,000 | ||||
| Less valuation allowance | (2,432,000) | (380,000) | ||||
| Total provision for income tax expense | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 |
| X | ||||||||||
- Definition Income tax expense valuation allowance. No definition available.
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- Definition Amount of current state, local, and federal tax expense (benefit) pertaining to income (loss) from continuing operations. No definition available.
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- References No definition available.
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- Definition Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of deferred state, local, and federal tax expense (benefit) pertaining to income (loss) from continuing operations. No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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