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Support Service Fees - Additional Information (Detail) - Administrative Support Services Agreement - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Support Service Fees [Line Items] |  |  |  |
Support service fees | $ 1,600,000 | $ 1,700,000 | $ 3,600,000 | $ 2,900,000
Prepaid Expenses and Other Current Assets |  |  |  |
Support Service Fees [Line Items] |  |  |  |
Net amount due from purchaser | $ 358,000 |  | $ 358,000 |

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