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Fair Value Measurements - Additional Information (Detail) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Feb. 13, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Interest-bearing cash equivalent consisted of money market fund | $ 155,600,000 |  |
Interest-bearing cash equivalent consisted of investment-grade commercial paper | 16,500,000 |  |
Marketable securities | 32,965,000 | $ 0 |
CRG Servicing LLC [Member] | Senior Secured Term Loan [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Carrying value of loan | 38,900,000 | 38,300,000 |
long-term debt | 36,600,000 | 36,000,000.0 |
Exit fee accrued |  |  | $ 2,100,000
Fair value of loan | 38,700,000 | 38,000,000.0 |
CRG Servicing LLC [Member] | Other Long-term Liabilities [Member] | Senior Secured Term Loan [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Exit fee accrued | $ 2,300,000 | $ 2,300,000 |
Investment Instruments [Member] | Credit Concentration Risk [Member] | Money Market Funds [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Percentage of concentration risk | 90.40% |  |
Investment Instruments [Member] | Credit Concentration Risk [Member] | Commercial Paper [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Percentage of concentration risk | 9.60% |  |

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