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Condensed Consolidated Balance Sheets (Unaudited) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Current assets:    
Cash and cash equivalents $ 8,674,395 $ 12,110,565
Restricted cash 2,422,500 2,422,500
Other receivables 30,671 53,405
Prepaid assets 555,445 625,296
Deferred financing costs, current   1,224
Total current assets 11,683,011 15,212,990
Property, plant and equipment, net 4,950,360 5,217,929
Intangible assets, net 42,322 45,816
Other assets, non-current 742,729 742,729
Total assets 17,418,422 21,219,464
Current liabilities:    
Accounts payable 1,925,435 2,512,045
Accrued expenses and other current liabilities 4,742,743 5,731,596
Loan payable net of discount, current 358,318 1,417,388
Deferred revenue, current 16,826 16,826
Capital lease obligation, current 16,175 20,032
Deferred rent, current 141,344 132,338
Total current liabilities 7,200,841 9,830,225
Capital lease obligations, non-current 13,146 15,878
Loan payable net of discount, non-current 8,916,641 8,916,641
Fair value of warrant liability 6,159,671 770,964
Deferred rent, non-current 1,586,346 1,621,338
Deferred revenue, non-current 25,052 29,258
Other long-term liabilities 369,370 369,370
Total liabilities $ 24,271,067 $ 21,553,674
Commitments and contingencies (Note 8)
Stockholders' deficit:    
Common stock, $0.01 par value; 200,000,000 shares authorized; issued and outstanding 11,601,880 at March 31, 2016 and 9,279,021 at December 31, 2015 [1] $ 116,019 $ 92,791
Additional paid-in capital 459,232,462 456,212,274
Accumulated deficit (466,248,039) (456,686,634)
Accumulated other comprehensive income 46,913 47,359
Total stockholders' deficit (6,852,645) (334,210)
Total liabilities and stockholders' deficit $ 17,418,422 $ 21,219,464
[1] * Adjusted for the 1-for-12 reverse stock split as discussed in Note 1.