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Long-Term Debt - Additional Information (Detail) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended		9 Months Ended
	Feb. 20, 2018	Feb. 28, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Aug. 01, 2019	Jul. 31, 2019	Mar. 29, 2019
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 175,000
Net proceeds from the initial term loan					$ 74,250	$ 99,000
Principal amount including interest paid in kind		$ 179,100	$ 179,100		$ 179,100
Debt maturity date		Dec. 31, 2023			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
Interest expense related to initial term loan			$ 4,700	$ 2,600	$ 11,800	$ 6,200
Loan Agreement | Maximum
Debt Instrument [Line Items]
Percentage of repayment premium of principal amount prepaid	7.00%
CRG Servicing LLC
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 175,000
Current borrowing capacity	$ 100,000								$ 75,000
Debt interest rate	9.50%
Debt instrument interest rate, effective percentage			10.30%		10.30%
Principal amount including interest paid in kind			$ 179,100		$ 179,100
Debt maturity date	Dec. 31, 2023
CRG Servicing LLC | Initial Term Loan
Debt Instrument [Line Items]
Net proceeds from the initial term loan	$ 99,000
CRG Servicing LLC | Second Tranche
Debt Instrument [Line Items]
Net proceeds from the initial term loan	$ 74,300

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Carrying amount of collateralized debt obligations, plus interest-in-kind, with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion.

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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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Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets.

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