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Convertible Senior Notes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 31, 2017 | Jun. 30, 2017 | Jan. 31, 2016 | Jun. 30, 2014 | Jul. 31, 2013 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, face amount |  |  |  |  |  | $ 155,728 |  |  |  | $ 155,728 |  | $ 206,865
Gain recognized on retirement of debt |  |  |  |  |  |  |  |  |  | 114 | $ 69 |
Payment for repurchase of convertible notes |  |  |  |  |  |  |  |  |  | 35,614 | 2,626 |
Long term debt |  |  |  |  |  | 21,500 |  |  |  | 21,500 |  |
Long term debt, current |  |  |  |  |  | 21,200 |  |  |  | 21,200 |  |
Amortization of debt issuance costs recognized as interest expense |  |  |  |  |  | 400 |  |  | $ 400 | 1,500 | $ 1,500 |
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 |  |  |  | 103.7613 |  |  |  |  |  |  |  |
Debt instrument, conversion rate |  |  |  | $ 9.64 |  |  |  |  |  |  |  |
Debt instrument repurchase amount |  |  | $ 2,000 |  |  |  |  |  |  |  |  |
Write-off of debt issuance costs |  |  | 100 |  |  |  |  |  |  |  |  |
Gain recognized on retirement of debt |  |  | $ 100 |  |  |  |  |  |  |  |  |
Convertible senior note payable, fair value |  |  |  |  |  | $ 88,600 |  |  |  | $ 88,600 |  | $ 89,300
Debt instrument, maturity year |  |  |  |  |  |  |  |  |  | 2020 |  | 2020
4.25% Convertible Senior Notes (due 2018) |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, face amount |  |  |  |  | $ 100,000 | $ 42,728 |  |  |  | $ 42,728 |  | $ 93,865
Debt instrument, interest rate |  |  |  |  | 4.25% | 4.25% |  |  |  | 4.25% |  | 4.25%
Debt instrument, maturity date |  |  |  |  | Aug. 01, 2018 |  |  |  |  |  |  |
Frequency of interest payment |  |  |  |  |  |  |  |  |  | Semi-annually |  |
Conversion rate in share per $1000 principal amount of notes |  |  |  |  | 114.3674 |  |  |  |  |  |  |
Debt instrument, conversion rate |  |  |  |  | $ 8.74 |  |  |  |  |  |  |
Debt instrument repurchase amount |  | $ 12,000 |  |  |  |  | $ 12,000 | $ 39,100 |  |  |  | $ 6,100
Write-off of debt issuance costs |  |  |  |  |  |  | 100 |  |  |  |  | 100
Gain recognized on retirement of debt |  |  |  |  |  |  | 100 |  |  |  |  |
Payment for repurchase of convertible notes |  |  |  |  |  |  | 11,600 | 24,100 |  |  |  |
Convertible senior note payable, fair value |  |  |  |  |  | $ 41,400 |  |  |  | $ 41,400 |  | $ 83,700
Debt instrument, maturity year |  |  |  |  |  |  |  |  |  | 2018 |  | 2018
4.25% Convertible Senior Notes (due 2018) | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument repurchase amount |  | $ 11,600 |  |  |  |  | $ 11,600 | $ 39,100 |  |  |  |
Debt instrument shares common stock issued upon conversion |  | 112,400 |  |  |  |  | 112,400 | 2,865,000 |  |  |  |
After Modification Senior Notes (due 2018) | 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 | 328.0302 |  |  |  |  |  |  |  |  |  |  |
Long term debt, current |  |  |  |  |  | $ 21,200 |  |  |  | $ 21,200 |  |

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