Summary of Borrowings (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Oct. 23, 2017
Debt Instrument [Line Items]
Principal amount	$ 129,200
Note payable to related party - net carrying amount	72,196	$ 79,666
Total debt - net carrying amount	129,359	156,822
Tranche B Notes
Debt Instrument [Line Items]
Principal amount	7,000
Senior convertible notes due December 31, 2019
Debt Instrument [Line Items]
Principal amount	32,000
Senior convertible notes due December 31, 2019 \| Tranche B Notes
Debt Instrument [Line Items]
Principal amount	39,000	54,407
Unamortized debt issuance costs and debt discount	(998)	(1,662)
Net carrying amount	38,002	52,745
5.75% Senior convertible notes due October 23, 2021
Debt Instrument [Line Items]
Principal amount	18,690	23,690	$ 23,700
Unamortized premium	471	721
Net carrying amount	$ 19,161	$ 24,411

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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