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v3.19.2

Borrowings - Senior Convertible Note - Additional Information (Detail) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
May 31, 2018 USD ($) $ / shares shares | Oct. 31, 2017 USD ($) d $ / shares shares | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) shares | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) shares
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount |  |  |  | $ 99,200 |  |  |
Gain (loss) on extinguishment of debt |  |  | $ 772 |  | $ (53) |  |
Common stock, shares issued | shares |  |  |  | 189,447,055 |  |  | 187,029,967
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% |  |  |  |  |
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 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. |  |  |
Percentage of conversion price equaling stock price |  | 120.00% |  |  |  |  |
Number of trading days | d |  | 10 |  |  |  |  |
Consecutive trading days |  | 20 days |  |  |  |  |
Debt Issuance Cost |  |  |  |  |  | $ 800 |
2021 Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes, effective interest rate |  | 5.75% |  |  |  |  |
Principal amount |  | $ 23,700 |  | $ 18,700 |  |  | $ 18,700
Conversion price of shares | $ / shares |  | $ 5.15 |  |  |  |  |
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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