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Long-Term Debt - Additional Information (Detail) - USD ($) $ in Thousands		1 Months Ended		12 Months Ended
	Feb. 20, 2018	Feb. 28, 2018	Dec. 31, 2016	Dec. 31, 2018	Oct. 31, 2016
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 175,000
Net proceeds from the initial term loan				$ 99,000
Principal amount including interest paid in kind		$ 101,800
Debt maturity date		Dec. 31, 2023
Note Purchase Agreement
Debt Instrument [Line Items]
Aggregate purchase price					$ 100,000
Amount paid to lender upon entering into agreement					1,000
Amount incurred in securing agreement					$ 1,600
Debt instrument, termination fee			$ 1,500
Loan Agreement
Debt Instrument [Line Items]
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				$ 8,800
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
Additional borrowing capacity	75,000
Net proceeds from the initial term loan	$ 99,000
Debt interest rate	9.50%
Debt instrument interest rate, effective percentage				10.10%
Principal amount including interest paid in kind				$ 101,800
Debt maturity date	Dec. 31, 2023

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Amount available for borrowing under long term debt agreement.

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Debt instrument, covenant daily minimum combined cash and investment balance.

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Debt instrument termination fee.

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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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Amount of assets pledged to secure a debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Amount of the fee that accompanies borrowing money under the debt instrument.

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

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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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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