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Concentrations of Credit Risk - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Concentration Risk [Line Items] |  |  |  |  |
Restricted cash | $ 3,046,000 |  | $ 3,046,000 |  | $ 3,004,000
Outstanding letters of credit to be collateralized by amounts on deposit | 3,000,000 |  | 3,000,000 |  |
Allowance for doubtful accounts | $ 0 |  | $ 0 |  | $ 0
Sales Revenue, Net [Member] | United [Member] | Customer Concentration Risk [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percentage | 99.00% | 99.00% | 98.00% | 98.00% |

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