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Condensed Consolidated Balance Sheets (Unaudited) - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 21,185,263 $ 24,987,603
Trade receivables 2,625 159,466
Other receivables 138,645 256,166
Prepaid assets 917,796 1,017,726
Deferred financing costs, current 4,162 22,082
Other assets, current 24,189 64,928
Total current assets 22,272,680 26,507,971
Property, plant and equipment, net 5,441,329 5,186,958
Intangible assets, net 294,329 356,889
Deferred financing costs, non-current   1,224
Other assets, non-current 373,717 373,717
Total assets 28,382,055 32,426,759
Current liabilities:    
Accounts payable 1,391,716 1,818,831
Accrued expenses and other current liabilities 5,627,486 4,869,710
Loan payable net of discount, current 2,453,451 4,686,388
Deferred revenue, current 16,826 16,826
Capital lease obligation, current 22,567 20,191
Deferred rent, current 123,333 85,925
Total current liabilities 9,635,379 11,497,871
Capital lease obligations, non-current 15,977 9,230
Loan payable net of discount, non-current 8,916,641 10,334,029
Fair value of warrant liability 615,925 1,684,551
Deferred rent, non-current 1,656,330 1,734,214
Deferred revenue, non-current 33,465 46,084
Other long-term liabilities 399,370 1,250,007
Total liabilities $ 21,273,087 $ 26,555,986
Commitments and contingencies (Note 8)
Stockholders' equity:    
Common stock, $0.01 par value; 225,000,000 shares authorized; issued and outstanding 108,589,273 at September 30, 2015 and 68,729,774 at December 31, 2014 $ 1,085,893 $ 687,298
Additional paid-in capital 453,702,872 425,389,693
Accumulated deficit (447,726,670) (420,271,608)
Accumulated other comprehensive income 46,873 65,390
Total stockholders' equity 7,108,968 5,870,773
Total liabilities and stockholders' equity $ 28,382,055 $ 32,426,759