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Summary of Borrowings (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Oct. 23, 2017
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Principal amount | $ 101,700 |  |
Note payable to related party - net carrying amount | 72,089 | $ 79,666 |
2019 Notes and Tranche B Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | 11,495 | 54,407 |
Unamortized debt issuance costs and debt discount | (197) | (1,662) |
Net carrying amount | 11,298 | 52,745 |
2021 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | 18,690 | 23,690 | $ 23,700
Unamortized premium | 409 | 721 |
Net carrying amount | $ 19,099 | $ 24,411 |

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