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ACCOUNTS PAYABLE AND ACCRUED EXPENSES (Tables)
 12 Months Ended
Dec. 31, 2012
Payables and Accruals [Abstract]  
Schedule of accounts payable and accrued expense
 
     2012   2011
Accounts payable
               $ 560           $ 226    
Accrued payroll
                  2,872             2,768   
Accrued outsourced pre-clinical and clinical fees
                  5,501             8,034   
Accrued professional fees
                  641              379    
Other accrued expenses
                  589              525    
 
               $ 10,163          $ 11,932