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Borrowings - Senior Convertible Notes Due 2021 - Additional Information (Detail) $ / shares in Units, $ in Thousands |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 14, 2018 USD ($) $ / shares shares | May 31, 2018 USD ($) | May 25, 2018 USD ($) $ / shares shares | Oct. 23, 2017 USD ($) d $ / shares shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 101,700 |  |
Gain (loss) on extinguishment of debt |  |  |  |  | $ (765) | $ (1,611) | $ 72,024
Common stock, shares issued | shares |  |  |  |  | 187,029,967 | 119,053,414 |
Common Stock |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of shares sold in underwritten public offering | shares |  |  |  | 973,236 |  |  |
5.75% Senior convertible notes due August 15, 2018 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes, effective interest rate |  |  |  | 5.75% |  |  |
Principal amount |  |  |  | $ 27,700 |  |  |
Conversion price of shares | $ / shares |  |  |  | $ 34 |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  | $ (800) |
Unamortized debt issuance costs |  |  |  |  |  | 300 |
Unamortized premium |  |  |  |  |  | 200 |
No of convertible shares |  |  |  | 194.1748 |  |  |
Principal amount per share | $ / shares |  |  |  | $ 1,000 |  |  |
Percentage of repurchase price |  |  |  | 100.00% |  |  |
Percentage of conversion price equaling stock price |  |  |  | 120.00% |  |  |
Number of trading days | d |  |  |  | 10 |  |  |
Consecutive trading days |  |  |  | 20 days |  |  |
Debt Instrument, redemption description |  |  |  |  | The Company may elect at its option to cause all or any portion of the senior convertible notes to be mandatorily converted in whole or in part at any time prior to the close of business on the business day immediately preceding the maturity date, if the last reported sale price of its common stock exceeds 120% of the conversion price then in effect for at least 10 trading days in any 20 consecutive trading day period, ending within five business days prior to the date of the mandatory conversion notice. The redemption price is equal the sum of 100% of the principal amount of the senior convertible notes to be redeemed, plus accrued and unpaid interest. |  |
Debt Issuance Cost |  |  |  |  | $ 800 |  |
2021 Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes, effective interest rate |  |  |  | 5.75% | 5.75% |  |
Principal amount |  |  |  | $ 23,700 | $ 18,690 | 23,690 |
Conversion price of shares | $ / shares |  |  |  | $ 5.15 |  |  |
Unamortized premium |  |  |  |  | $ 409 | $ 721 |
Exchange price per share | $ / shares | $ 1.13 |  |  |  |  |  |
Conversion Option, shares | shares | 475,520 |  |  |  |  |  |
2021 Notes | Accrued Interest |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Conversion of notes to common shares, value | $ 500 |  |  |  |  |  |
2021 Notes | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Common stock, shares issued | shares |  |  |  | 13,648,300 |  |  |
2021 Notes | Privately Negotiated Exchange Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  | $ 800 |  |  |  |  |
Common stock, shares issued | shares |  |  | 2,250,000 |  |  |  |
Conversion of notes to common shares, value |  |  | $ 5,000 |  |  |  |
Exchange price per share | $ / shares |  |  | $ 2.2567 |  |  |  |
Exchange completion date |  |  | May 31, 2018 |  |  |  |

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