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Certain Balance Sheet Items Prepaid Expenses and Other Assets (Details) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Prepaid Expenses and Other Assets Disclosure [Abstract]    
Prepaid manufacturing expenses $ 5,884,040 $ 8,152,602
Prepaid research and development expenses 3,522,250 2,274,551
Other prepaid expense 1,338,758 2,250,791
Other assets 356,328 74,944
Prepaid expenses and other assets 11,101,376 12,752,888
Less long-term portion 2,675,692 0
Prepaid expenses and other assets $ 8,425,684 $ 12,752,888