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Condensed Consolidated Balance Sheets (Unaudited) (USD $)
Mar. 31, 2012
Dec. 31, 2011
Current assets:    
Cash and cash equivalents $ 9,454,753 $ 13,311,261
Marketable securities, current 2,147,699 3,280,591
Trade receivables 101,650 54,527
Other receivables 218,225 213,500
Prepaid assets 373,175 506,464
Other assets, current 41,078 22,063
Total current assets 12,336,580 17,388,406
Property, plant and equipment, net 1,854,962 2,054,563
Other assets, non-current 1,808,048 1,856,057
Goodwill 1,949,641 1,895,000
Other intangible assets, net 1,994,670 2,011,473
Total assets 19,943,901 25,205,499
Current liabilities:    
Accounts payable 930,527 1,066,495
Accrued expenses and other current liabilities 1,952,022 2,970,251
Accrued wind-down expenses, current 1,428,597 1,360,766
Deferred revenue, current 39,371 43,910
Capital lease obligation, current 0 17,979
Deferred rent, current 1,627 2,603
Bonds payable, current 195,000 191,250
Total current liabilities 4,547,144 5,653,254
Bonds payable, non-current 281,250 331,250
Fair value of warrant liability 11,023,307 6,042,315
Deposits and other long-term liabilities 281,807 281,807
Accrued wind-down expenses, non-current 390,723 774,020
Deferred rent, non-current 1,321,174 1,301,167
Deferred revenue, non-current 92,355 96,562
Total liabilities 17,937,760 14,480,375
Commitments and contingencies (Note 7)      
Stockholders' equity:    
Common stock, $0.01 par value; 75,000,000 shares authorized; issued and outstanding 23,444,881 at March 31, 2012 and 22,427,955 at December 31, 2011 1,482,945 1,472,776
Additional paid-in capital 343,213,305 341,811,657
Accumulated deficit (342,829,461) (332,600,022)
Accumulated other comprehensive income 139,352 40,713
Total stockholders' equity 2,006,141 10,725,124
Total liabilities and stockholders' equity $ 19,943,901 $ 25,205,499