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Long-Term Debt - Additional Information (Detail) - USD ($)		3 Months Ended		6 Months Ended
	Feb. 20, 2018	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Aug. 01, 2019	Jul. 31, 2019
Debt Instrument [Line Items]
Net proceeds from the initial term loan					$ 74,250,000
Principal amount including interest paid in kind		$ 180,900,000		$ 180,900,000
Long-term debt, net of debt discount		1,248,000		$ 1,248,000		$ 1,394,000
Debt maturity date				Dec. 31, 2023
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		$ 4,700,000	$ 4,500,000	$ 9,400,000	$ 7,100,000
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%		10.30%
Principal amount including interest paid in kind		$ 180,900,000		$ 180,900,000
Long-term debt, net of debt discount		$ 1,200,000		$ 1,200,000
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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