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CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Current assets:    
Cash and cash equivalents $ 23,640 $ 24,449
Inventory 109 182
Prepaid expenses and other current assets 1,423 1,200
Total current assets 25,172 25,831
Property, plant and equipment (net) 166 167
Total assets 25,338 25,998
Current liabilities:    
Accounts payable 1,116 1,763
Accrued liabilities and other current liabilities 4,504 4,664
Economic rights 1,153  
Other liabilities measured at fair value 29 71
Total current liabilities 6,802 6,498
Total liabilities 6,802 6,498
Stockholders' equity:    
Preferred stock, $0.001 par value; 5,000,000 shares authorized at December 31, 2011 and March 31, 2012; 1,213,142 shares issued and outstanding at December 31, 2011 and March 31, 2012. Aggregate preference in liquidation of $13,708,505 and $13,890,476 at December 31, 2011 and March 31, 2012, respectively 1 1
Common stock, $0.001 par value; 100,000,000 shares authorized at December 31, 2011 and March 31, 2012; 54,220,458 and 58,993,414 shares issued and outstanding at December 31, 2011 and March 31, 2012, respectively 59 54
Additional paid-in capital 278,430 276,452
Accumulated other comprehensive loss 65 57
Deficit accumulated during the development stage (260,019) (257,064)
Total stockholders' equity 18,536 19,500
Total liabilities and stockholders' equity $ 25,338 $ 25,998