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CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 24,449 | $ 29,495
Prepaid expenses and other current assets | 1,069 | 1,244
Current assets of discontinued operations | 313 | 312
Total current assets | 25,831 | 31,051
Property, plant and equipment (net) | 167 | 408
Total assets | 25,998 | 31,459
Current liabilities: |  |
Accounts payable | 1,717 | 1,590
Accrued and other current liabilities | 4,183 | 3,754
Warrants and other derivatives | 71 | 680
Current liabilities of discontinued operations | 527 | 511
Total current liabilities | 6,498 | 6,535
Total liabilities | 6,498 | 6,535
Commitments and contingencies |  |
Stockholders' equity: |  |
Preferred stock, $0.001 par value; 5,000,000 shares authorized at December 31, 2010 and 2011, respectively; 1,213,142 shares issued and outstanding at December 31, 2010 and 2011. Aggregate preference in liquidation of $13,344,562 and $13,708,505 at December 31, 2010 and December 31, 2011, respectively. | 1 | 1
Common stock, $0.001 par value; 100,000,000 shares authorized at December 31, 2010 and 2011, respectively; 6,652,131 and 7,745,780 shares issued and outstanding at December 31, 2010 and 2011, respectively | 8 | 7
Additional paid-in capital | 276,498 | 266,706
Accumulated other comprehensive income | 57 | 31
Deficit accumulated during the development stage | (257,064) | (241,821)
Total stockholders' equity | 19,500 | 24,924
Total liabilities and stockholders' equity | $ 25,998 | $ 31,459

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