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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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Contractual interest rate for funds borrowed, under the debt agreement.

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