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Convertible Senior Notes - Additional Information (Detail) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 01, 2018 $ / shares | Jul. 26, 2018 USD ($) | Aug. 31, 2017 USD ($) shares | Jun. 30, 2017 USD ($) shares | Jan. 31, 2016 USD ($) | Jun. 30, 2014 USD ($) $ / shares shares | Jul. 31, 2013 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) shares | Mar. 31, 2017 USD ($) shares | Sep. 30, 2018 USD ($) shares | Sep. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2018 USD ($) | Aug. 01, 2018 USD ($) | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of debt issuance costs recognized as interest expense |  |  |  |  |  |  |  | $ 200 | $ 400 |  | $ 700 | $ 1,500 |  |  |  |
Long term debt, face amount |  |  |  |  |  |  |  | 146,436 |  |  | 146,436 |  |  |  |  | $ 156,647
Gain recognized on retirement of debt |  |  |  |  |  |  |  | (453) |  |  | (453) | 114 |  |  |  |
Payment for repurchase of convertible notes |  |  |  |  |  |  |  |  |  |  |  | 35,614 |  |  |  |
Unrealized loss related to a fair market value adjustment |  |  |  |  |  |  |  | 917 |  |  | (2,514) |  |  |  |  |
4.875% Convertible Senior Notes (due 2020) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, face amount |  |  |  |  |  | $ 115,000 |  | $ 113,000 |  |  | $ 113,000 |  |  |  |  | $ 113,000
Debt instrument, interest rate |  |  |  |  |  | 4.875% |  | 4.875% |  |  | 4.875% |  |  |  |  | 4.875%
Debt instrument, maturity date |  |  |  |  |  | Jun. 01, 2020 |  |  |  |  |  |  |  |  |  |
Frequency of interest payment |  |  |  |  |  |  |  |  |  |  | semi-annually |  |  |  |  |
Conversion rate in share per $1000 principal amount of notes | shares |  |  |  |  |  | 103.7613 |  |  |  |  |  |  |  |  |  |
Debt instrument, conversion rate | $ / shares |  |  |  |  |  | $ 9.64 |  |  |  |  |  |  |  |  |  |
Write-off of debt issuance costs |  |  |  |  | $ 100 |  |  |  |  |  |  |  |  |  |  |
Debt instrument repurchase amount |  |  |  |  | 2,000 |  |  |  |  |  |  |  |  |  |  |
Gain recognized on retirement of debt |  |  |  |  | $ 100 |  |  |  |  |  |  |  |  |  |  |
Convertible senior note payable, fair value |  |  |  |  |  |  |  | $ 97,300 |  |  | $ 97,300 |  |  | $ 89,700 |  |
4.25% Convertible Senior Notes (due 2018) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, face amount |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  | $ 21,178
Debt instrument, interest rate |  | 4.25% |  |  |  |  | 4.25% | 4.25% |  |  | 4.25% |  |  |  |  | 4.25%
Debt instrument, maturity date |  | Aug. 01, 2018 |  |  |  |  | Aug. 01, 2018 |  |  |  |  |  |  |  |  |
Frequency of interest payment |  |  |  |  |  |  |  |  |  |  | semi-annually |  |  |  |  |
Conversion rate in share per $1000 principal amount of notes | shares |  |  |  |  |  |  | 114.3674 |  |  |  |  |  |  |  |  |
Debt instrument, conversion rate | $ / shares |  |  |  |  |  |  | $ 8.74 |  |  |  |  |  |  |  |  |
Write-off of debt issuance costs |  |  |  |  |  |  |  |  | 100 |  |  |  | $ 100 |  |  |
Debt instrument repurchase amount |  |  |  |  |  |  |  |  | 12,000 | $ 39,100 |  | $ 12,000 | $ 6,100 |  |  |
Gain recognized on retirement of debt |  |  |  |  |  |  |  |  | 100 |  |  |  |  |  |  |
Payment for repurchase of convertible notes |  |  |  |  |  |  |  |  | $ 11,600 | $ 24,100 |  |  |  |  |  |
Debt amount converted |  | $ 8,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
4.25% Convertible Senior Notes (due 2018) | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument repurchase amount |  |  |  | $ 11,600 |  |  |  | $ 39,100 |  |  | $ 39,100 |  |  |  |  |
Debt instrument shares common stock issued upon conversion | shares |  |  |  | 112,400 |  |  |  |  | 112,400 | 2,900,000 | 2,865,000 |  |  |  |  |
3.25% Convertible Senior Notes (due 2020) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, face amount |  | $ 8,000 |  |  |  |  |  | $ 33,436 |  |  | $ 33,436 |  |  |  |  | $ 22,469
Debt instrument, interest rate |  | 3.25% |  |  |  |  |  | 3.25% |  |  | 3.25% |  |  |  |  | 3.25%
Debt instrument, maturity date |  | Nov. 01, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain recognized on retirement of debt |  | $ 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion rate in share per $1000 principal amount of notes |  | 322.2688 |  |  |  |  |  |  |  |  |  |  |  |  |  |
3.25% Convertible Senior Notes (due 2020) | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, conversion rate | $ / shares | $ 2.54 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt conversion price, percentage | 105.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible, terms of conversion | The conversion price for the 3.25% convertible senior notes will be reset on November 1, 2018 and November 1, 2019 (each, a “reset date”) to a price equal to 105% above the 5-day VWAP preceding the reset date; provided, however, among other reset restrictions, that if the conversion price resulting from such reset is lower than 90 percent of the average VWAP during the 90 calendar days preceding the reset date, then the reset price shall be the 30-day VWAP preceding the reset date. The conversion price reset on November 1, 2018 to $2.54 per share. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
3.25% Convertible Senior Notes (due 2020) | Oasis Management and Oasis Investments ll Master Fund Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, face amount |  |  | $ 21,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  | 3.25% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  | Nov. 01, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion rate in share per $1000 principal amount of notes | shares |  |  | 328.0302 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain recognized on retirement of debt |  |  |  |  |  |  |  |  |  |  | $ 600 |  |  |  |  |
Unrealized loss related to a fair market value adjustment |  |  |  |  |  |  |  | $ 900 |  |  | (2,500) |  |  |  |  |
Convertible senior note payable, fair value |  |  |  |  |  |  |  | $ 33,400 |  |  | $ 33,400 |  |  |  |  | $ 22,500
Debt instrument, amount redeemed |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,200 |

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