Summary of Significant Accounting Policies - Additional Information (Detail) |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
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Sep. 30, 2021
USD ($)
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Sep. 30, 2020
USD ($)
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Sep. 30, 2021
USD ($)
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Sep. 30, 2020
USD ($)
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Dec. 31, 2020
USD ($)
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| Summary Of Significant Accounting Policies [Line Items] | |||||
| Maturity period of highly liquid investments | three months or less | ||||
| Realized gains or losses on marketable securities | $ 0 | $ 0 | $ 0 | $ 0 | |
| Number of securities in unrealized loss position for more than 12 months | 0 | 0 | 0 | ||
| Grants receivable recognized | $ 3,700,000 | $ 1,000,000.0 | $ 7,700,000 | $ 3,400,000 | |
| Government grants receivable | 4,400,000 | 4,400,000 | $ 1,100,000 | ||
| Grant award funding remaining | $ 10,500,000 | $ 10,500,000 | |||
| X | ||||||||||
- Definition Decrease in research and development expenses related to grants recognized. No definition available.
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| X | ||||||||||
- Definition Grant award funding remaining. No definition available.
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| X | ||||||||||
- Definition Highly Liquid Investments Maturity Period No definition available.
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| X | ||||||||||
- Definition Receivable from grants for costs incurred. No definition available.
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| X | ||||||||||
- Definition Summary of Significant Accounting Policies [Line Items] No definition available.
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| X | ||||||||||
- Definition Number of investment positions in available-for-sale investments that have been in a continuous unrealized loss position for greater than or equal to a year for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. No definition available.
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| X | ||||||||||
- Definition Amount of realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI). No definition available.
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