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Facility Agreement - Additional Information (Detail) (USD $) | 9 Months Ended | 283 Months Ended |  |  |  |  |  | 9 Months Ended |  |  | 0 Months Ended |  |  |  | 0 Months Ended |  |  |  |  |  |  |  | 9 Months Ended |  |
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Sep. 30, 2014 | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2014 Tranche B notes | Jul. 01, 2013 Senior convertible notes due December 31, 2019 | Sep. 30, 2014 Senior convertible notes due December 31, 2019 Tranche B notes Maximum | Jul. 01, 2013 Deerfield Milestone Rights Liability Maximum | Sep. 30, 2014 Deerfield Senior convertible notes due December 31, 2019 | Feb. 28, 2014 Deerfield Senior convertible notes due December 31, 2019 | Sep. 30, 2014 Deerfield Senior convertible notes due December 31, 2019 Maximum Facility Agreement | Jul. 01, 2013 Deerfield Senior convertible notes due December 31, 2019 Notes Issued in Four Equal Tranches Tranche | Sep. 30, 2014 Deerfield Senior convertible notes due December 31, 2019 Notes Issued in Four Equal Tranches | Jul. 01, 2013 Deerfield Senior convertible notes due December 31, 2019 Notes Issued in Four Equal Tranches | Sep. 30, 2014 Deerfield Senior convertible notes due December 31, 2019 Fourth tranche | Feb. 28, 2014 Deerfield Senior convertible notes due December 31, 2019 Tranche B notes | Sep. 23, 2014 Deerfield Senior convertible notes due December 31, 2019 Tranche B notes | Jul. 18, 2014 Deerfield Senior convertible notes due December 31, 2019 Tranche B notes | May 06, 2014 Deerfield Senior convertible notes due December 31, 2019 Tranche B notes | Feb. 28, 2014 Deerfield Senior convertible notes due December 31, 2019 Tranche B notes | Mar. 31, 2014 Deerfield Senior convertible notes due December 31, 2019 Tranche Three | Apr. 30, 2014 Deerfield Senior convertible notes due December 31, 2019 Tranche One | Mar. 31, 2014 Deerfield Senior convertible notes due December 31, 2019 Tranche One | Sep. 30, 2014 Deerfield Senior convertible notes due December 31, 2019 Milestone Rights Liability | Jul. 01, 2013 Deerfield Senior convertible notes due December 31, 2019 Milestone Rights Liability | Sep. 30, 2014 Deerfield Senior convertible notes due December 31, 2019 Tranche One and Tranche Three
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt facility principal amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 160,000,000 |  |  |  |  |  | $ 90,000,000 |  |  |  |  |  |
Number of equal tranches |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt facility periodic principal amount |  |  |  |  |  |  |  |  |  |  |  |  | 40,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Senior notes, effective interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 9.75% |  |  | 8.75% |  |  | 9.75% |  |  |  |  |  | 11.63%
Principal amount of notes purchased |  |  |  |  |  |  |  |  |  |  |  | 160,000,000 |  | 160,000,000 |  |  | 40,000,000 | 20,000,000 |  |  |  |  |  |  |
Repayment as a percentage of original principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |
Debt instrument maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2019 |  |  |  |  |  |  |  |  |  |
Maximum secured loan facility |  |  |  |  |  |  |  |  |  |  |  |  | 160,000,000 |  |  | 175,000,000 |  |  |  |  |  |  |  |  |
Aggregate principal amount of convertible notes |  |  |  |  |  |  |  | 0 | 60,000,000 |  |  |  |  |  |  |  |  |  |  | 40,000,000 | 7,500,000 | 12,500,000 |  |  |
Common shares issuable upon conversion |  |  |  |  |  |  |  | 18,616,304 | 12,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum available amount of credit facility under covenant restrictions |  |  |  |  |  |  |  |  |  | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent liability for milestone payments |  |  |  |  |  |  | 90,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,900,000 |  |
Short term liability |  |  | 102,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,200,000 | 3,200,000 |
Long term liability | 72,625,000 | 72,625,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,900,000 | 13,100,000 |
Required payment pursuant to the terms of the Milestone Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |
Commitment asset at fair value |  |  |  | 2,921,000 | 2,900,000 | 70,000,000 |  |  |  |  |  | 0 |  |  |  |  |  | 1,800,000 |  |  |  |  |  |  |
Amount of common shares issued upon conversion | $ 93,500,000 | $ 100,000,000 |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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