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Accounts Payable and Accrued Expenses (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Payables and Accruals [Abstract]    
Trade accounts payable, including from affiliated entity $ 5,920,642 $ 4,292,374
Accrued compensation 6,531,983 4,157,440
Accrued subcontract costs 5,475,359 946,597
Accrued license fees 0 2,300,000
Other accrued expenses 1,669,803 1,368,488
Accounts payable and accrued liabilities $ 19,597,787 $ 13,064,899