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Consolidated Balance Sheets (USD $)
Dec. 31, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 30,585,424 $ 8,471,275
Marketable securities, current   13,900,678
Trade receivables 108,815 110,159
Other receivables 486,222 200,788
Prepaid assets 530,037 537,590
Deferred financing costs, current 46,420  
Other current assets 83,537 820,827
Total current assets 31,840,455 24,041,317
Property, plant and equipment, net 5,304,684 1,375,329
Other assets, non-current 413,717 947,301
Goodwill 2,139,294 1,983,426
Other intangible assets, net 1,835,717 1,822,904
Deferred financing costs, non-current 23,307  
Total assets 41,557,174 30,170,277
Current liabilities:    
Accounts payable 1,151,903 999,365
Accrued expenses and other current liabilities 4,067,916 2,707,441
Accrued wind-down expenses, current   1,102,762
Deferred revenue, current 67,245 74,426
Capital lease obligation, current 21,316 6,888
Deferred rent, current 34,366  
Bonds payable, current 125,000 206,250
Loan payable net of discount, current 3,664,370  
Total current liabilities 9,132,116 5,097,132
Capital lease obligation, non-current 29,422 12,646
Bonds payable, non-current   125,000
Fair value of warrant liability 5,541,809 9,265,365
Other long-term liabilities 801,388 216,439
Loan payable net of discount, non-current 9,244,874  
Deferred rent, non-current 1,790,943 1,389,342
Deferred revenue, non-current 62,910 79,736
Total liabilities 26,603,462 16,185,660
Commitments and contingencies (Note 12)      
Stockholders' equity:    
Common stock, $0.01 par value; 225,000,000 shares authorized; issued and outstanding 55,138,311 at December 31, 2013 and 37,506,305 at December 31, 2012 551,383 375,063
Additional paid-in capital 401,680,562 374,507,552
Accumulated deficit (387,530,334) (361,091,175)
Accumulated other comprehensive income 252,101 193,177
Total stockholders equity 14,953,712 13,984,617
Total liabilities and stockholders equity $ 41,557,174 $ 30,170,277