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Consolidated Balance Sheets (USD $)
Jun. 30, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 22,232,348 $ 12,825,090
Restricted cash 601,411 601,351
Prepaid expenses 220,662 143,867
Total current assets 23,054,421 13,570,308
Property, equipment and leasehold improvements, net 2,593,657 2,311,942
Other assets 168,385 179,415
Total assets 25,816,463 16,061,665
Current liabilities:    
Accounts payable 874,692 1,152,550
Capital lease payable-current portion 19,326 32,606
Derivative warrant liability 0 14,584,818
Accrued expenses 663,062 1,021,275
Total current liabilities 1,557,080 16,791,249
Loan payable-less current portion 1,920,000 1,578,000
Capital lease payable-less current portion    2,799
Total liabilities 3,477,080 18,372,048
Commitments and contingencies      
Stockholders' equity (deficit):    
Common stock, $0.00001 par value, authorized 200,000,000 shares at June 30, 2013 and December 31, 2012; issued and outstanding 78,350,361 and 65,881,122 shares at June 30, 2013 and December 31, 2012, respectively 784 659
Additional paid-in capital 93,104,022 40,842,339
Deficit accumulated during the development stage (70,765,423) (43,153,381)
Total stockholders' equity (deficit) 22,339,383 (2,310,383)
Total liabilities and stockholders' equity (deficit) $ 25,816,463 $ 16,061,665