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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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- Definition 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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