Senior Debt - Summary of Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Debt	$ 74,725	$ 74,456
Term Loan [Member]
Debt Instrument [Line Items]
Total outstanding borrowings	76,147	76,147
Term Debt [Member]
Debt Instrument [Line Items]
Unamortized debt discount	$ (1,422)	$ (1,691)

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No definition available.

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Amount, after accumulated amortization, of debt discount.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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