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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
	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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