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Accounts Payable and Accrued Expenses (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Payables and Accruals [Abstract]    
Trade accounts payable $ 852,573 $ 1,140,296
Accrued compensation 1,560,704 1,516,307
Accrued severance expenses 0 494,287
Accrued subcontract expenses 72,238 687,715
Accrued accounting and audit fees 177,810 119,225
Accrued R&D program costs 250,000 0
Other accrued expenses 268,249 361,112
Accounts payable and accrued liabilities $ 3,181,574 $ 4,318,942