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Schedule of Related Party Debt (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Related Party Transaction [Line Items] |  |
Principal amount | $ 101,700 |
Net carrying amount | 72,036 | $ 72,089
Related Party Debt |  |
Related Party Transaction [Line Items] |  |
Principal amount | 71,506 | 71,506
Unamortized premium | 581 | 639
Unaccreted debt issuance costs | (51) | (56)
Net carrying amount | $ 72,036 | $ 72,089

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