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Liability Related to Sale of Future Royalties - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended		1 Months Ended		0 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Mar. 31, 2013 Milestone Scenario One [Member]	Mar. 31, 2014 Milestone Scenario Two [Member]	Feb. 24, 2012 Purchase and Sale Agreement with RPI [Member]
Liability Related to Sale of Future Royalties [Line Items]
Proceeds from sale of royalty rights							$ 124,000,000
Non-cash royalty revenue	4,837,000	3,828,000	10,610,000	8,221,000
Annual interest rate			0.17
Payment made for milestone not achieved year one					3,000,000
Payment made for milestone not achieved year two						$ 7,000,000
Royalty agreement contingent payment description			As a result of worldwide net sales of MIRCERAfor the 12 month periods ended on December 31, 2013 and 2012 not reaching certain minimum thresholds