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CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)
Jun. 30, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 22,752,895 $ 8,471,275
Marketable securities, current 1,426,061 13,900,678
Trade receivables 68,472 110,159
Other receivables 418,489 200,788
Prepaid assets 568,968 537,590
Deferred financing costs, current 55,964  
Other assets, current 704,041 820,827
Total current assets 25,994,890 24,041,317
Property, plant and equipment, net 3,450,968 1,375,329
Deferred financing costs, non-current 43,255  
Other assets, non-current 1,053,850 947,301
Goodwill 1,855,117 1,983,426
Other intangible assets, net 1,654,085 1,822,904
Total assets 34,052,165 30,170,277
Current liabilities:    
Accounts payable 3,021,521 999,365
Accrued expenses and other current liabilities 1,917,581 2,707,441
Accrued wind-down expenses, current   1,102,762
Deferred revenue, current 23,597 74,426
Capital lease obligation, current 7,141 6,888
Deferred rent, current 28,050  
Loan payable net of discount, current 2,609,954  
Bonds payable, current 213,750 206,250
Total current liabilities 7,821,594 5,097,132
Bonds payable, non-current 17,500 125,000
Capital lease obligations, non-current 9,011 12,646
Loan payable net of discount, non-current 6,976,234  
Fair value of warrant liability 8,277,443 9,265,365
Deposits and other long-term liabilities 367,726 216,439
Deferred rent, non-current 1,753,349 1,389,342
Deferred revenue, non-current 71,323 79,736
Total liabilities 25,294,180 16,185,660
Commitments and contingencies (Note 8)      
Stockholders' equity:    
Common stock, $0.01 par value; 75,000,000 shares authorized; issued and outstanding 41,260,461 at June 30, 2013 and 37,506,305 at December 31, 2012 412,605 375,063
Additional paid-in capital 381,756,774 374,507,552
Accumulated deficit (373,376,304) (361,091,175)
Accumulated other comprehensive income (35,090) 193,177
Total stockholders' equity 8,757,985 13,984,617
Total liabilities and stockholders' equity $ 34,052,165 $ 30,170,277