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Long-Term Debt - Additional Information (Detail) - USD ($)		12 Months Ended
	Feb. 20, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Aug. 01, 2019	Jul. 31, 2019
Debt Instrument [Line Items]
Net proceeds from the initial term loan			$ 74,250,000	$ 99,000,000
Long-term debt, net of debt discount		$ 1,094,000	1,394,000
Loan Agreement
Debt Instrument [Line Items]
Percentage of fee payable upon partial prepayment or maturity					4.00%	3.00%
Percentage of capital stock of subsidiaries subject to certain exception	65.00%
Debt instrument, covenant daily minimum combined cash and investment balance	$ 15,000,000.0
Interest expense related to initial term loan		$ 19,100,000	$ 16,500,000	$ 8,800,000
CRG Servicing LLC
Debt Instrument [Line Items]
Maximum borrowing capacity	175,000,000.0
Net proceeds from the initial term loan	$ 173,300,000
Debt interest rate	9.50%
Debt instrument interest rate, effective percentage		10.30%
Principal amount including interest paid in kind		$ 180,900,000
Long-term debt, net of debt discount		$ 1,100,000
Debt maturity date	Dec. 31, 2023	Dec. 31, 2023

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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-Topic 470
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