Fair Value Measurements (Details 2) (USD $)	3 Months Ended				3 Months Ended		3 Months Ended
	Mar. 31, 2014	Mar. 31, 2014 Notes	Feb. 28, 2014 Notes	Feb. 14, 2014 Notes	Mar. 31, 2014 Access MuGard Rights	Jun. 06, 2013 Access MuGard Rights	Mar. 31, 2014 Access MuGard Rights Recurring basis Significant Unobservable Inputs (Level 3)	Mar. 31, 2014 Access MuGard Rights Minimum	Mar. 31, 2014 Access MuGard Rights Maximum
Reconciliation of contingent consideration obligations related to acquisition of MuGard rights
Balance at beginning of period					$ 14,550,000
Payments made					(31,000)
Adjustments to fair value of contingent consideration	789,000				789,000
Other adjustments					74,000
Balance at end of period					15,382,000
Fair value of the contingent consideration						13,700,000
Estimated undiscounted royalty amounts payable								28,000,000	34,000,000
Period over which estimated undiscounted royalty amounts could be paid					10 years
Discount rate (as a percent)							15.00%
Contingent consideration classified as short-term liability					1,300,000
Aggregate principal amount of notes issued			200,000,000	200,000,000
Interest rate (as a percent)	2.50%	2.50%
Estimated fair value of the Notes		$ 161,800,000