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Investments - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2023 USD ($) Note | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Schedule Of Investments [Line Items] |  |  |
Interest on available for sale investment | $ 500,000 | $ 500,000 |
Accretion or amortization | 1,600,000 | 700,000 |
Allowance for credit losses | $ 0 | 0 |
Accrued interest receivable |  | 600,000 |
Amount receivable on matured investment |  | 5,100,000 |
Convertible Promissory Note | Thirona Bio, Inc. |  |  |
Schedule Of Investments [Line Items] |  |  |
Number of notes | Note | 2 |  |
Amount Due | $ 8,000,000 |  |
Stated interest rate | 6.00% |  |
Investment securities | $ 6,900,000 | 7,100,000 |
Available-for-Sale Investment, credit losses | 200,000 | 900,000 |
Unrealized holding gain or loss | 0 | $ 0 | $ 0
Prepaid Expenses and Other Current Assets |  |  |
Schedule Of Investments [Line Items] |  |  |
Accrued interest receivable | $ 500,000 |  |

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