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Summary of Borrowings (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Aug. 10, 2015
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Note payable to principal stockholder - net carrying amount | $ 49,521 | $ 49,521 |
Senior convertible notes due December 31, 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | 75,000 | 80,000 |
Unamortized debt discount | (3,661) | (5,418) |
Net carrying amount | 71,339 | 74,582 |
5.75% Senior convertible notes due August 15, 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | 27,690 | 27,690 | $ 27,700
Unamortized premium | 426 | 660 | $ 700
Unaccreted debt issuance costs | (481) | (737) |
Net carrying amount | $ 27,635 | $ 27,613 |

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