Summary of Significant Accounting Policies (Details 3) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenue Recognition on Product Sales
Increase in net product sales	$ 34,266,000	$ 27,609,000	$ 62,363,000	$ 36,604,000
Increase in cost of product sales	1,762,000	1,661,000	$ 3,380,000	2,155,000
Sales return period			12 months
Milestone revenues recorded	$ 750,000	2,000,000	$ 750,000	2,000,000
Sales deductions
Revenue Recognition on Product Sales
Increase in net product sales		15,400,000		15,400,000
Increase in cost of product sales		$ 900,000		$ 900,000