Related Party Transactions (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Related Party Transaction [Line Items]
Accounts payable	$ 69,017	$ 503,763
Collaborative arrangement [Member]
Related Party Transaction [Line Items]
Net product revenues	4,304,519	3,201,464	2,015,584
Royalties	3,079,379	2,650,831	1,051,184
Other deferred revenue	0	21,974,383	17,067,649
Total net revenues	7,383,898	27,826,678	20,134,417
Cost of product revenues	3,913,199	2,874,873	1,357,098
Gross profit	3,470,699	24,951,805	18,777,319
Accounts receivable	2,263,508	1,760,304	2,101,161
Accounts payable	$ 69,017	$ 503,763	$ 275,885