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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 $ 36,733 $ 5,530
Receivables 11 9
Other current assets 453 636
Total current assets 37,197 6,175
Property and equipment, net 1,467 1,564
Total assets 38,664 7,739
Current liabilities:    
Accounts payable and accrued expenses 3,384 2,963
Accrued employee benefits 1,398 1,042
Current portion of long-term debt 40 40
Warrant liabilities 17,525 16,625
Total current liabilities 22,347 20,670
Long-term debt 29 40
Total liabilities 22,376 20,710
Series B-1 non-voting convertible preferred stock, no par value; shares authorized and reserved - zero and 39, respectively; shares issued and outstanding - zero and 12, respectively 38,012  
Shareholders' deficit:    
Common stock, no par value; shares authorized - 150,000; shares issued and outstanding - 38,635 and 38,756, respectively 229,868 228,877
Deficit accumulated during the development stage (251,592) (241,848)
Total shareholders' deficit (21,724) (12,971)
Total liabilities, convertible preferred stock and shareholders' deficit $ 38,664 $ 7,739