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Long-Term Debt - Additional Information (Detail) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended
	Feb. 20, 2018	Feb. 28, 2018	Mar. 31, 2018
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		$ 100,200
Debt maturity date		Dec. 31, 2023
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			$ 1,100
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			$ 100,200
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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Percentage of repayment premium of principal amount prepaid.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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-Publisher FASB
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-Topic 230
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-Section 45
-Paragraph 14
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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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