Summary of Significant Accounting Policies (Details 4) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Revenue Recognition on Product Sales
Increase in net product sales	$ 38,551,000	$ 22,452,000	$ 100,914,000	$ 59,056,000
Increase in cost of product sales	2,248,000	1,321,000	5,628,000	3,476,000
Reduction in net revenues	39,362,000	22,687,000	103,778,000	61,443,000
Accrued sales deductions	18,820,000	7,298,000	18,820,000	7,298,000	$ 8,461,000
Royalty Revenue [Abstract]
Non-recourse liability related to sale of future royalties		30,000,000		30,000,000
Royalty revenue	776,000	199,000	2,007,000	199,000
Non-cash interest expense/income on liability related to sale of future royalties	998,000	326,000	$ 2,530,000	326,000
Sales return period prior to expiry date			6 months
Sales return period subsequent to expiry date			12 months
Milestone revenues recorded	0	0	$ 750,000	2,000,000
Sales deductions
Revenue Recognition on Product Sales
Increase in net product sales		7,900,000		7,900,000
Increase in cost of product sales		$ 500,000		$ 500,000
Reduction in net revenues	$ (2,900,000)		$ (2,900,000)