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Long-Term Debt - Additional Information (Detail) - USD ($) $ in Thousands		12 Months Ended
	Feb. 20, 2018	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	$ 99,000
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
Interest expense related to initial term loan		$ 16,500	$ 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
Net proceeds from the initial term loan	$ 173,300
Debt interest rate	9.50%
Debt instrument interest rate, effective percentage		10.30%
Principal amount including interest paid in kind		$ 178,600
Debt discount		$ 1,400
Debt maturity date	Dec. 31, 2023	Dec. 31, 2023

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Amount available for borrowing under long term debt agreement.

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Percentage of fee payable upon partial prepayment or maturity.

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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 noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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

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