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Condensed Consolidated Balance Sheets (USD $)
Sep. 30, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 20,955,293 $ 8,471,275
Marketable securities, current   13,900,678
Trade receivables 125,487 110,159
Other receivables 491,556 200,788
Prepaid assets 464,464 537,590
Deferred financing costs, current 51,808  
Other assets, current 110,615 820,827
Total current assets 22,199,223 24,041,317
Property, plant and equipment, net 5,438,659 1,375,329
Deferred financing costs, non-current 32,571  
Other assets, non-current 999,776 947,301
Goodwill 1,973,302 1,983,426
Other intangible assets, net 1,673,051 1,822,904
Total assets 32,316,582 30,170,277
Current liabilities:    
Accounts payable 1,860,544 999,365
Accrued expenses and other current liabilities 2,303,506 2,707,441
Accrued wind-down expenses, current   1,102,762
Deferred revenue, current 67,588 74,426
Capital lease obligation, current 20,936 6,888
Deferred rent, current 28,050  
Loan payable net of discount, current 3,602,972  
Bonds payable, current 178,750 206,250
Total current liabilities 8,062,346 5,097,132
Bonds payable, non-current   125,000
Capital lease obligations, non-current 34,896 12,646
Loan payable net of discount, non-current 9,865,375  
Fair value of warrant liability 8,420,954 9,265,365
Deposits and other long-term liabilities 512,320 216,439
Deferred rent, non-current 1,792,683 1,389,342
Deferred revenue, non-current 67,116 79,736
Total liabilities 28,755,690 16,185,660
Commitments and contingencies (Note 8)      
Stockholders' equity:    
Common stock, $0.01 par value; 75,000,000 shares authorized; issued and outstanding 42,044,839 at September 30, 2013 and 37,506,305 at December 31, 2012 420,449 375,063
Additional paid-in capital 383,537,795 374,507,552
Accumulated deficit (380,567,957) (361,091,175)
Accumulated other comprehensive income 170,605 193,177
Total stockholders' equity 3,560,892 13,984,617
Total liabilities and stockholders' equity $ 32,316,582 $ 30,170,277