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NATURE OF OPERATIONS AND BASIS OF PRESENTATION (Details) (USD $)
 1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended
May 31, 2012
Jun. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2010
Aug. 31, 2012
Subsequent event
Sinclair
Aug. 10, 2012
Subsequent event
Sinclair
Minimum
Nature of Operations                
Cash and cash equivalents   $ 19,964,000 $ 19,964,000 $ 24,449,000 $ 20,614,000 $ 29,495,000    
Period for which cash and cash equivalents are sufficient to meet anticipated short-term working capital needs and to fund our on-going sapacitabine clinical trials     12 months          
Preferred stock dividend                
Dividend rate (as a percent)   6.00%            
NASDAQ appeal                
Regain compliance period     180 days          
Maximum exception period 180 days              
Closing bid price of common stock that should be evidenced to regain compliance (in dollars per share) $ 1.00              
Period from NASDAQ Staff's notification, during which the closing bid price of the common stock must equals to or exceed the specified closing bid price to regain compliance 10 days              
Subsequent Developments                
Quarterly installments receivable under royalty arrangement               $ 1,000,000
Period of royalty arrangement             3 years