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Consolidated Balance Sheets - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 12,110,565 $ 24,987,603
Restricted cash 2,422,500  
Trade receivables   159,466
Other receivables 53,405 256,166
Prepaid assets 625,296 1,017,726
Deferred financing costs, current 1,224 22,082
Other assets, current   64,928
Total current assets 15,212,990 26,507,971
Property, plant and equipment, net 5,217,929 5,186,958
Other intangible assets, net 45,816 356,889
Deferred financing costs, non-current   1,224
Other assets, non-current 742,729 373,717
Total assets 21,219,464 32,426,759
Current liabilities:    
Accounts payable 2,512,045 1,818,831
Accrued expenses and other current liabilities 5,731,596 4,869,710
Loan payable net of discount, current 1,417,388 4,686,388
Deferred revenue, current 16,826 16,826
Capital lease obligation, current 20,032 20,191
Deferred rent, current 132,338 85,925
Total current liabilities 9,830,225 11,497,871
Capital lease obligations, non-current 15,878 9,230
Loan payable net of discount, non-current 8,916,641 10,334,029
Fair value of warrant liability 770,964 1,684,551
Deferred rent, non-current 1,621,338 1,734,214
Deferred revenue, non-current 29,258 46,084
Other long-term liabilities 369,370 1,250,007
Total liabilities $ 21,553,674 $ 26,555,986
Commitments and contingencies (Note 12)
Stockholders' equity (deficit):    
Common stock, $0.01 par value; 225,000,000 shares authorized; issued and outstanding 111,348,241 at December 31, 2015 and 68,729,774 at December 31, 2014 $ 1,113,483 $ 687,298
Additional paid-in capital 455,191,582 425,389,693
Accumulated deficit (456,686,634) (420,271,608)
Accumulated other comprehensive income 47,359 65,390
Total stockholders' equity (deficit) (334,210) 5,870,773
Total liabilities and stockholders' equity (deficit) $ 21,219,464 $ 32,426,759