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v3.24.3

Investments - Additional Information (Detail) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) Note | Sep. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
Schedule Of Investments [Line Items] |  |  |  |  |  |
Interest on held to maturity investments | $ 3,200,000 | $ 1,500,000 | $ 9,800,000 | $ 4,000,000 |  |
Net accretion on investments held to maturity | 2,100,000 | 500,000 | 6,000,000 | 900,000 |  |
Allowance for credit losses | 0 |  | 0 |  |  | $ 0
Prepaid Expenses and Other Current Assets |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |
Accrued interest receivable | $ 1,100,000 |  | $ 1,100,000 |  |  | $ 500,000
Convertible Promissory Note | Thirona Bio, Inc. |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |
Hypothetical yield percentage | 28 |  | 28 |  |  | 35
Volatility percentage | 70 |  | 70 |  |  | 90
Interest on available for sale investment | $ 0 | 100,000 | $ 0 | 400,000 |  |
Number of notes | Note |  |  | 2 |  |  |
Amount Due | $ 8,000,000 |  | $ 8,000,000 |  | $ 8,000,000 |
Stated interest rate | 10.00% |  | 10.00% |  |  |
Investment securities | $ 5,900,000 |  | $ 5,900,000 |  |  | $ 6,900,000
Recognized gain (loss) |  | 900,000 | 1,600,000 | 900,000 |  |
Unrealized holding gain |  | $ 400,000 | $ 600,000 | $ 400,000 |  |

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