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Condensed Consolidated Balance Sheets (Unaudited) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Current assets:    
Cash and cash equivalents $ 7,203,428 $ 13,311,261
Marketable securities, current 1,699,814 3,280,591
Trade receivables 120,858 54,527
Other receivables 191,159 213,500
Prepaid assets 403,673 506,464
Other assets, current 790,308 22,063
Total current assets 10,409,240 17,388,406
Property, plant and equipment, net 1,683,142 2,054,563
Other assets, non-current 1,050,550 1,856,057
Goodwill 1,913,173 1,895,000
Other intangible assets, net 1,897,395 2,011,473
Total assets 16,953,500 25,205,499
Current liabilities:    
Accounts payable 758,968 1,066,495
Accrued expenses and other current liabilities 1,793,824 2,970,251
Accrued wind-down expenses, current 1,497,741 1,360,766
Deferred revenue, current 27,272 43,910
Capital lease obligation, current   17,979
Deferred rent, current 651 2,603
Bonds payable, current 198,750 191,250
Total current liabilities 4,277,206 5,653,254
Bonds payable, non-current 231,250 331,250
Fair value of warrant liability 5,396,170 6,042,315
Deposits and other long-term liabilities 246,437 281,807
Accrued wind-down expenses, non-current   774,020
Deferred rent, non-current 1,349,615 1,301,167
Deferred revenue, non-current 88,149 96,562
Total liabilities 11,588,827 14,480,375
Commitments and contingencies (Note 7)      
Stockholders' equity:    
Common stock, $0.01 par value; 75,000,000 shares authorized; issued and outstanding 25,377,631 at June 30, 2012 and 22,427,955 at December 31, 2011 1,502,272 1,472,776
Additional paid-in capital 345,787,856 341,811,657
Accumulated deficit (341,995,939) (332,600,022)
Accumulated other comprehensive income 70,484 40,713
Total stockholders' equity 5,364,673 10,725,124
Total liabilities and stockholders' equity $ 16,953,500 $ 25,205,499