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Debt - January 2012, May 2014, and November 2015 Exchangeable Senior Notes - Additional Information (Detail) |  | 1 Months Ended | 3 Months Ended | 6 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 ($) | Mar. 31, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Jun. 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, repayment |  |  |  |  |  |  |  | 15,107,000 |  |
Convertible senior notes, carrying value, exchanged |  |  |  |  |  |  |  |  |  | $ 127,300,000
Gain on change in fair value of derivative liabilities |  |  |  |  |  |  | $ 5,810,000 |  | $ 4,560,000 |
Interest |  |  |  |  |  |  |  | $ 7,546,000 | 7,668,000 |
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 |  |  |  |  |  |  |  |  | 1,500,000 |
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 |  |  |  |  |  |  |  |  | $ 400,000 |
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 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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- Definition The cash outflow for cost incurred in the modification of term of existing debt agreement in order for the entity to achieve some advantage. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The cash inflow from the issuance of a long-term debt 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 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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