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Long-Term Debt - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Feb. 20, 2018
Sep. 30, 2021
Jun. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Mar. 29, 2019
Debt Instrument [Line Items]                
Debt maturity date           May 15, 2026    
Loss on debt extinguishment (Note 8)   $ 0   $ 0   $ (5,232,000) $ 0  
Final payment           190,194,000    
Interest expense related to initial term loan   1,674,000       2,547,000    
Loan Agreement                
Debt Instrument [Line Items]                
Interest expense related to initial term loan   $ 0   $ 4,800,000   $ 7,000,000.0 $ 14,200,000  
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          
Final payment         $ 190,200,000