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Income Taxes - Additional Information (Detail) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Operating Loss Carryforwards [Line Items] |  |
Cumulative loss period | 5 years |
Valuation allowance | $ 49,400,000 |
Outstanding tax audit |  | $ 0
State [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Federal income tax returns subject to examination description | State income tax returns are subject to examination for a period of three to four years after filing |

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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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