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Condensed Consolidated Balance Sheets (Unaudited) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 7,231,078 $ 8,471,275
Marketable securities, current 9,817,509 13,900,678
Trade receivables 61,613 110,159
Other receivables 251,227 200,788
Prepaid assets 434,003 537,590
Other assets, current 818,081 820,827
Total current assets 18,613,511 24,041,317
Property, plant and equipment, net 1,519,687 1,375,329
Other assets, non-current 1,059,687 947,301
Goodwill 1,853,042 1,983,426
Other intangible assets, net 1,718,265 1,822,904
Total assets 24,764,192 30,170,277
Current liabilities:    
Accounts payable 1,429,083 999,365
Accrued expenses and other current liabilities 1,418,397 2,707,441
Accrued wind-down expenses, current 628,760 1,102,762
Deferred revenue, current 48,595 74,426
Capital lease obligation, current 7,014 6,888
Bonds payable, current 210,000 206,250
Total current liabilities 3,741,849 5,097,132
Capital lease obligations, non-current 10,845 12,646
Bonds payable, non-current 71,250 125,000
Fair value of warrant liability 9,035,131 9,265,365
Other long-term liabilities 216,439 216,439
Deferred rent, non-current 1,404,917 1,389,342
Deferred revenue, non-current 75,529 79,736
Total liabilities 14,555,960 16,185,660
Commitments and contingencies (Note 7)      
Stockholders' equity:    
Common stock, $0.01 par value; 75,000,000 shares authorized; issued and outstanding 38,887,586 at March 31, 2013 and 37,506,305 at December 31, 2012 388,874 375,063
Additional paid-in capital 377,366,468 374,507,552
Accumulated deficit (367,507,622) (361,091,175)
Accumulated other comprehensive income (loss) (39,488) 193,177
Total stockholders' equity 10,208,232 13,984,617
Total liabilities and stockholders' equity $ 24,764,192 $ 30,170,277