Related Party Transactions Schedule of related party transactions (Details) (Collaborative Arrangement [Member], USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Collaborative Arrangement [Member]
Related Party Transaction [Line Items]
Net product revenues	$ 1,922,782	$ 511,560	$ 2,163,183	$ 938,340
Royalties	727,558	602,818	1,327,558	1,142,818
Amortization of deferred revenue	0	8,590,874	0	16,984,800
Milestone payment	0	5,000,000	0	5,000,000
Total net revenues	2,650,340	14,705,252	3,490,741	24,065,958
Cost of product revenues	1,747,809	429,355	1,966,333	817,488
Gross profit	902,531	14,275,897	1,524,408	23,248,470
Accounts rceivable	1,862,967	6,540,972	1,862,967	6,540,972
Accounts payable	$ 43,504	$ 503,763	$ 43,504	$ 503,763	$ 503,763