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Summary of Borrowings (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Oct. 23, 2017
Debt Instrument [Line Items]
Principal amount	$ 101,700
Note payable to related party - net carrying amount	72,036	$ 72,089
Total debt - net carrying amount	102,486	102,486
2019 Notes and Tranche B Notes
Debt Instrument [Line Items]
Principal amount	11,495	11,495
Unamortized debt issuance costs and debt discount	(110)	(197)
Net carrying amount	11,385	11,298
2021 Notes
Debt Instrument [Line Items]
Principal amount	18,690	18,690	$ 23,700
Unamortized debt issuance costs and debt discount	375	409
Net carrying amount	$ 19,065	$ 19,099

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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