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Summary of Borrowings (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Oct. 23, 2017
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Principal amount | $ 104,700 |  |
Note payable to related party - net carrying amount | 72,143 | $ 79,666 |
Total debt - net carrying amount | 105,478 | 156,822 |
Senior convertible notes due December 31, 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | 12,000 |  |
Senior convertible notes due December 31, 2019 | Tranche B Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | 14,495 | 54,407 |
Unamortized debt issuance costs and debt (discount) premium | (293) | (1,662) |
Net carrying amount | 14,202 | 52,745 |
5.75% Senior convertible notes due October 23, 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | 18,690 | 23,690 | $ 23,700
Unamortized debt issuance costs and debt (discount) premium | 443 | 721 |
Net carrying amount | $ 19,133 | $ 24,411 |

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