Related Party Transactions Schedule of related party transactions (Details) (Collaborative Arrangement [Member], USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Collaborative Arrangement [Member]
Related Party Transaction [Line Items]
Net product revenues	$ 1,426,890	$ 574,956	$ 3,590,073	$ 1,513,296
Royalties	904,839	702,336	2,232,397	1,845,154
Amortization of deferred revenue	0	0	0	16,974,383
Milestone payment	0	0	0	5,000,000
Total net revenues	2,331,729	1,277,292	5,822,470	25,332,833
Cost of product revenues	1,297,043	636,232	3,263,376	1,453,720
Gross profit	1,034,686	641,060	2,559,094	23,879,113
Accounts rceivable	1,622,278	932,052	1,622,278	932,052
Accounts payable	$ 17,313	$ 83,792	$ 17,313	$ 83,792	$ 503,763