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Debt - January 2012, May 2014, and November 2015 Exchangeable Senior Notes - Additional Information (Detail) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 31, 2017 USD ($) | Aug. 31, 2016 USD ($) shares | Nov. 30, 2015 USD ($) | May 31, 2014 USD ($) | Jan. 31, 2012 USD ($) | Mar. 31, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) shares
Debt Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of convertible debt, net of transaction costs |  |  |  |  |  |  |  | $ 30,000,000 |  |
Convertible senior notes, principal amount |  |  |  |  |  |  |  |  | $ 128,115,000 |
Convertible senior notes, repayment |  |  |  |  |  |  |  | 15,107,000 |  |
Convertible senior notes, carrying value, exchanged |  |  |  |  |  |  |  |  |  | $ 127,300,000
Transaction costs |  |  |  |  |  |  |  |  | 678,000 |
Gain on change in fair value of derivative liabilities |  |  |  |  |  |  | $ 3,610,000 |  | 8,170,000 |
Interest |  |  |  |  |  |  |  | $ 12,536,000 | 13,839,000 |
Convertible Debt |  |  |  |  |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Convertible senior notes, stated interest rate |  |  |  |  |  |  |  | 3.50% |  |
Convertible senior notes, principal amount |  |  |  |  |  |  |  |  |  | 150,000,000
Convertible notes, interest expense |  |  |  |  |  |  |  |  | 6,900,000 |
Accrued interest on convertible note |  |  |  |  |  |  |  | $ 0 |  | 200,000
Interest |  |  |  |  |  |  |  | 300,000 | 2,500,000 |
Convertible Debt | Non Cash |  |  |  |  |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Convertible notes, interest expense |  |  |  |  |  |  |  |  | 4,000,000 |
Convertible Debt | Cash |  |  |  |  |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Convertible notes, interest expense |  |  |  |  |  |  |  | 100,000 | 2,900,000 |
Convertible Debt | Common Shares |  |  |  |  |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Carrying amount of debt conversion option |  |  |  |  |  |  |  |  |  | $ 40,100,000
Convertible Debt | American Depositary Shares |  |  |  |  |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Convertible senior notes, total ADS into which the debt is exchangeable | shares |  |  |  |  |  |  |  |  |  | 60,311,188
Transaction costs |  |  |  |  |  |  |  |  |  | $ 700,000
Convertible Debt | 2012 Notes |  |  |  |  |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Convertible senior notes, principal amount |  |  | $ 15,100,000 | $ 31,300,000 | $ 150,000,000 |  |  | 0 |  | 15,100,000
Convertible senior notes, stated interest rate | 3.50% |  |  |  | 3.50% |  |  |  |  |
Convertible senior notes, due date | 2032 |  |  |  | 2032 |  |  |  |  |
Proceeds from issuance of convertible debt, net of transaction costs |  |  |  |  | $ 144,300,000 |  |  |  |  |
Convertible senior notes, principal amount purchase | $ 15,000,000 |  | 16,200,000 |  |  | $ 15,000,000 |  |  |  |
Convertible senior notes, repurchase price at option of the issuer | 100.00% |  |  |  | 100.00% |  |  |  |  |
Convertible senior notes, aggregate principal amount redeemed |  |  |  |  |  | $ 100,000 |  | 100,000 |  |
Convertible senior notes, outstanding amount |  |  |  |  |  |  |  | $ 0 |  |
Carrying amount of debt conversion option |  |  |  |  | $ 23,800,000 |  |  |  |  |
Decrease to additional paid-in capital for repurchase of conversion option in convertible notes |  |  |  | 10,100,000 |  |  |  |  |  |
Note, estimated remaining life |  |  |  |  | 24 months |  |  | 24 months |  |
Convertible senior notes, discount |  |  |  |  |  |  |  |  |  | 0
Convertible Debt | 2012 Notes | Other Debt Obligations |  |  |  |  |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Convertible senior notes, fair value |  |  |  |  | $ 126,200,000 |  |  |  |  |
Convertible Debt | 2014 Notes |  |  |  |  |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Convertible senior notes, principal amount |  | $ 118,700,000 |  | $ 118,700,000 |  |  |  | $ 0 |  | 0
Convertible senior notes, stated interest rate |  |  |  | 3.50% |  |  |  |  |  |
Convertible senior notes, due date |  |  |  | 2032 |  |  |  |  |  |
Convertible senior notes, principal amount |  |  |  | $ 118,700,000 |  |  |  |  |  |
Convertible senior notes, repurchase price at option of the issuer |  |  |  | 100.00% |  |  |  |  |  |
Convertible senior notes, fair value |  |  |  | $ 90,800,000 |  |  |  |  |  |
Decrease to additional paid-in capital for repurchase of conversion option in convertible notes |  |  | 1,300,000 |  |  |  |  |  |  |
Convertible senior notes, discount |  |  |  | 27,900,000 |  |  |  |  |  |
Offering costs |  |  |  | 2,500,000 |  |  |  |  |  |
Derivative liability at fair value |  |  |  | $ 3,500,000 |  |  |  |  |  |
Gain on change in fair value of derivative liabilities |  |  |  |  |  |  |  |  | 2,100,000 |
Convertible Debt | 2014 Notes | Final As-Adjusted | American Depositary Shares |  |  |  |  |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Convertible senior notes, exchange rate of ADS per $1,000 principal amount of notes |  | 402.0746 |  |  |  |  |  |  |  |
Convertible senior notes, total ADS into which the debt is exchangeable | shares |  | 47,739,925 |  |  |  |  |  |  |  |
Convertible Debt | 2015 Notes |  |  |  |  |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Convertible senior notes, principal amount |  | $ 31,300,000 | $ 31,300,000 |  |  |  |  | 0 |  | 0
Convertible senior notes, stated interest rate |  |  | 3.50% |  |  |  |  |  |  |
Convertible senior notes, due date |  |  | 2032 |  |  |  |  |  |  |
Proceeds from issuance of convertible debt, net of transaction costs |  |  | $ 27,500,000 |  |  |  |  |  |  |
Convertible senior notes, repayment |  |  | $ 15,900,000 |  |  |  |  |  |  |
Equity component of convertible notes issuance cost |  |  |  |  |  |  |  |  |  | 87,400,000
Debt instrument increase accrued interest |  |  |  |  |  |  |  |  |  | 800,000
Convertible senior notes, repurchase price at option of the issuer |  |  | 100.00% |  |  |  |  |  |  |
Convertible senior notes, fair value |  |  | $ 27,500,000 |  |  |  |  |  |  |
Carrying amount of debt conversion option |  |  |  |  |  |  |  | $ 11,500,000 |  | $ 11,500,000
Convertible senior notes, discount |  |  | 3,800,000 |  |  |  |  |  |  |
Offering costs |  |  | 100,000 |  |  |  |  |  |  |
Derivative liability at fair value |  |  | $ 500,000 |  |  |  |  |  |  |
Gain on change in fair value of derivative liabilities |  |  |  |  |  |  |  |  | $ 600,000 |
Convertible Debt | 2015 Notes | Final As-Adjusted | American Depositary Shares |  |  |  |  |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Convertible senior notes, exchange rate of ADS per $1,000 principal amount of notes |  | 402.0746 |  |  |  |  |  |  |  |
Convertible senior notes, total ADS into which the debt is exchangeable | shares |  | 12,571,263 |  |  |  |  |  |  |  |

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- Definition Amount of increase (decrease) in additional paid in capital (APIC) resulting from recognition of deferred taxes for convertible debt with a beneficial conversion feature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 55 -Paragraph 51 -URI http://asc.fasb.org/extlink&oid=96868398&loc=d3e34017-109320 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition The portion of the carrying value of long-term convertible debt as of the balance sheet date that is scheduled to be repaid within one year or in the normal operating cycle if longer. Convertible debt is a financial instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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