Income Taxes - Additional Information (Detail) - USD ($) |
Dec. 31, 2022 |
Dec. 31, 2021 |
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| Income Taxes And Tax Related [Line Items] | ||
| Net operating loss carry forwards | $ 3,921,434,000 | $ 4,265,000,000 |
| Valuation allowance | 737,374,000 | 740,397,000 |
| Uncertain tax positions | 0 | 0 |
| Federal | ||
| Income Taxes And Tax Related [Line Items] | ||
| Research and development credits | $ 41,000 | $ 41,000 |
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- Definition Income Taxes And Tax Related [Line Items] No definition available.
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of unrecognized tax benefits. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Details
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