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Debt - January 2017 Exchangeable Senior Notes - Additional Information (Detail) |  |  |  | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 02, 2018 USD ($) shares | Jan. 20, 2017 USD ($) d $ / shares | Jan. 19, 2017 $ / shares | Sep. 30, 2018 USD ($) shares | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Debt Disclosure [Line Items] |  |  |  |  |  |
Interest expense, non-cash |  |  |  | $ 1,687,000 | $ 1,736,000 |
Convertible Debt | 2017 Notes |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |
Convertible senior notes, principal amount |  | $ 30,000,000 |  | $ 30,000,000 |  |
Convertible senior notes, stated interest rate |  | 3.50% |  |  |  |
Convertible senior notes, due date |  | 2047 |  |  |  |
Convertible senior notes, repurchase price at option of the issuer |  | 100.00% |  |  |  |
Net proceeds from offering |  | $ 28,800,000 |  |  |  |
Convertible senior notes, total ADS into which the debt is exchangeable | shares |  |  |  | 7,716,048 |  |
Accrued interest on convertible note |  |  |  | $ 200,000 |  | $ 200,000
Convertible senior notes, interest payable dates |  |  |  | payable semi-annually in arrears on January 15 and July 15 of each year, beginning on July 15, 2017 |  |
Convertible senior notes, payment start date |  | Jul. 15, 2017 |  |  |  |
Convertible senior notes, maturity date |  | Jan. 15, 2047 |  |  |  |
Convertible senior notes, percentage of premium initial exchange price |  |  | 35.00% |  |  |
Value of shares in excess of principal amount of Notes based on closing price |  |  |  | $ 95,500,000 |  |
Convertible senior notes, redemption start date |  | Jan. 19, 2021 |  |  |  |
Convertible senior notes redemption, end date |  | Jan. 15, 2047 |  |  |  |
Convertible senior notes, mandatory exchange in whole or in part if daily VWAP equals or exceeds percentage of exchange price |  | 130.00% |  |  |  |
Convertible senior notes, mandatory exchange in whole or in part if daily VWAP, stock trigger price | $ / shares |  | $ 5.05 |  |  |  |
Convertible senior notes, mandatory exchange in whole or in part if daily VWAP equals or exceeds percentage of exchange price, at least number of VWAP Trading days | d |  | 20 |  |  |  |
Convertible senior notes, mandatory exchange in whole or in part if daily VWAP equals or exceeds percentage of exchange price, in any number of VWAP Trading days | d |  | 30 |  |  |  |
Convertible senior notes, discount |  | $ 1,200,000 |  | 800,000 |  | 1,000,000
Convertible notes, carrying amount net of unamortized discount |  |  |  | 29,200,000 |  | $ 29,000,000
Convertible notes, interest expense |  |  |  | 1,000,000 | 900,000 |
Interest expense, contractual coupon interest |  |  |  | 800,000 | 700,000 |
Interest payments on notes |  |  |  | 1,100,000 | 500,000 |
Convertible Debt | 2017 Notes | Minimum |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |
Percentage of holders of principal amount required to issue notice on default |  | 25.00% |  |  |  |
Convertible Debt | 2017 Notes | American Depositary Shares |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |
Convertible senior notes, exchange rate of ADS per $1,000 principal amount of notes |  | 257.2016 |  |  |  |
Convertible senior notes, initial exchange price | $ / shares |  | $ 3.89 | $ 2.88 |  |  |
Convertible Debt | 2017 Notes | Scenario Forecast |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |
Convertible senior notes, outstanding amount | $ 0 |  |  |  |  |
Accrued interest on convertible note | $ 0 |  |  |  |  |
Convertible Debt | 2017 Notes | Scenario Forecast | American Depositary Shares |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |
Convertible senior notes, total ADS into which the debt is exchangeable | shares | 7,716,048 |  |  |  |  |
Convertible Debt | 2017 Notes | Non Cash |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |
Interest expense, non-cash |  |  |  | $ 200,000 | $ 100,000 |

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