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Long-Term Debt - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Feb. 20, 2018 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Mar. 29, 2019
Debt Instrument [Line Items] |  |  |  |  |  |
Debt maturity date |  |  |  | May 15, 2026 |  |
Loss on debt extinguishment (Note 8) |  | $ (5,232,000) |  | $ (5,232,000) |  |
Final payment |  |  |  | 190,194,000 |  |
Interest expense related to initial term loan |  | 873,000 |  | 873,000 |  |
Loan Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest expense related to initial term loan |  | 2,300,000 | $ 4,700,000 | 7,000,000.0 | $ 9,400,000 |
CRG Servicing LLC |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity | $ 175,000,000.0 |  |  |  |  |
Current borrowing capacity | 100,000,000.0 |  |  |  |  | $ 75,000,000.0
Net proceeds from the initial term loan | $ 173,300,000 |  |  |  |  |
Debt interest rate | 9.50% |  |  |  |  |
Debt maturity date | Dec. 31, 2023 |  |  |  |  |
Loss on debt extinguishment (Note 8) |  | $ 5,200,000 |  | 5,200,000 |  |
Final payment |  |  |  | $ 190,200,000 |  |

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