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Condensed Consolidated Balance Sheets (Unaudited) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Current assets:    
Cash and cash equivalents $ 15,712,688 $ 13,311,261
Marketable securities, current 6,031,735 3,280,591
Trade receivables 99,479 54,527
Other receivables 220,462 213,500
Prepaid assets 388,292 506,464
Other assets, current 791,454 22,063
Total current assets 23,244,110 17,388,406
Property, plant and equipment, net 1,535,590 2,054,563
Other assets, non-current 1,033,206 1,856,057
Goodwill 1,967,570 1,895,000
Other intangible assets, net 1,876,976 2,011,473
Total assets 29,657,452 25,205,499
Current liabilities:    
Accounts payable 960,501 1,066,495
Accrued expenses and other current liabilities 1,510,037 2,970,251
Accrued wind-down expenses, current 1,317,676 1,360,766
Deferred revenue, current 55,955 43,910
Capital lease obligation, current 6,765 17,979
Deferred rent, current   2,603
Bonds payable, current 202,500 191,250
Total current liabilities 4,053,434 5,653,254
Bonds payable, non-current 178,750 331,250
Capital lease obligations, non-current 14,415  
Fair value of warrant liability 14,483,148 6,042,315
Deposits and other long-term liabilities 246,439 281,807
Accrued wind-down expenses, non-current   774,020
Deferred rent, non-current 1,373,767 1,301,167
Deferred revenue, non-current 83,942 96,562
Total liabilities 20,433,895 14,480,375
Commitments and contingencies (Note 7)      
Stockholders' equity:    
Common stock, $0.01 par value; 75,000,000 shares authorized; issued and outstanding 35,018,336 at September 30, 2012 and 22,427,955 at December 31, 2011 1,598,679 1,472,776
Additional paid-in capital 365,787,830 341,811,657
Accumulated deficit (358,332,729) (332,600,022)
Accumulated other comprehensive income 169,777 40,713
Total stockholders' equity 9,223,557 10,725,124
Total liabilities and stockholders' equity $ 29,657,452 $ 25,205,499