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CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 16,412 | $ 24,449
Prepaid expenses and other current assets | 1,599 | 1,069
Current assets of discontinued operations | 861 | 313
Total current assets | 18,872 | 25,831
Property, plant and equipment (net) | 129 | 167
Long-term assets of discontinued operations | 353 |
Total assets | 19,354 | 25,998
Current liabilities: |  |
Accounts payable | 2,259 | 1,717
Accrued and other current liabilities | 5,601 | 4,183
Economic Rights measured at fair value | 1,120 |
Other liabilities measured at fair value | 20 | 71
Current liabilities of discontinued operations | 335 | 527
Total current liabilities | 9,335 | 6,498
Total liabilities | 9,335 | 6,498
Commitments and contingencies |  |
Stockholders' equity: |  |
Preferred stock, $0.001 par value; 5,000,000 shares authorized at December 31, 2011 and 2012; 1,213,142 shares issued and outstanding at December 31, 2011 and 2012. Aggregate preference in liquidation of $13,708,505 and $14,436,390 at December 31, 2011 and December 31, 2012, respectively | 1 | 1
Common stock, $0.001 par value; 100,000,000 shares authorized at December 31, 2011 and 2012; 7,745,780 and 8,686,484 shares issued and outstanding at December 31, 2011 and 2012, respectively | 9 | 8
Additional paid-in capital | 280,211 | 276,498
Accumulated other comprehensive income | 48 | 57
Deficit accumulated during the development stage | (270,250) | (257,064)
Total stockholders' equity | 10,019 | 19,500
Total liabilities and stockholders' equity | $ 19,354 | $ 25,998

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