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CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 33,668 $ 16,412
Prepaid expenses and other current assets 2,670 1,599
Current assets of discontinued operations 817 861
Total current assets 37,155 18,872
Property, plant and equipment (net) 169 129
Long-term assets of discontinued operations 186 353
Total assets 37,510 19,354
Current liabilities:    
Accounts payable 2,437 2,259
Accrued and other current liabilities 3,797 5,601
Economic Rights measured at fair value   1,120
Other liabilities measured at fair value 20 20
Current liabilities of discontinued operations 325 335
Total current liabilities 6,579 9,335
Total liabilities 6,579 9,335
Commitments and contingencies (Note 7)      
Stockholders' equity:    
Preferred stock, $0.001 par value; 5,000,000 shares authorized at December 31, 2012 and June 30, 2013; 1,213,142 and 420,682 shares issued and outstanding at December 31, 2012 and June 30, 2013, respectively. Aggregate preference in liquidation of $14,436,390 and $5,006,116 at December 31, 2012 and June 30, 2013, respectively   1
Common stock, $0.001 par value; 100,000,000 shares authorized at December 31, 2012 and June 30, 2013; 8,686,484 and 17,715,113 shares issued and outstanding at December 31, 2012 and June 30, 2013, respectively 17 9
Additional paid-in capital 311,125 280,211
Accumulated other comprehensive income (loss) (5) 48
Deficit accumulated during the development stage (280,206) (270,250)
Total stockholders' equity 30,931 10,019
Total liabilities and stockholders' equity $ 37,510 $ 19,354