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v3.19.1

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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