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Summary of Borrowings (Detail) - USD ($) | Dec. 31, 2017 | Oct. 23, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Principal amount | $ 157,800,000 |  |
Note payable to principal stockholder - net carrying amount | 79,666,000 |  | $ 49,521,000
Senior convertible notes due December 31, 2019 | Tranche B Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | 54,407,000 |  | 75,000,000
Unamortized debt issuance costs and debt discount | (1,662,000) |  | (3,661,000)
Net carrying amount | 52,745,000 |  | 71,339,000
5.75% Senior convertible notes due October 23, 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | 23,690,000 | $ 23,690,000 | 27,690,000
Unamortized premium | 721,000 | $ 800,000 | 426,000
Unaccreted debt issuance costs |  |  | (481,000)
Net carrying amount | $ 24,411,000 |  | $ 27,635,000

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