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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
Inventory 182 174
Prepaid expenses and other current assets 1,200 1,382
Total current assets 25,831 31,051
Property, plant and equipment (net) 167 408
Total assets 25,998 31,459
Current liabilities:    
Accounts payable 1,763 1,723
Accrued and other current liabilities 4,664 4,132
Warrants and other derivatives 71 680
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; 46,564,914 and 54,220,458 shares issued and outstanding at December 31, 2010 and 2011, respectively 54 47
Additional paid-in capital 276,452 266,666
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