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STOCK-BASED COMPENSATION (Tables)
3 Months Ended
Mar. 31, 2013
Equity [Abstract]  
Stock-based compensation expense
   Three Months Ended
 (in thousands)  March 31,
   2013  2012
       
Operating expenses:          
Research and development  $142   $304 
General and administrative   1,693    474 
Total stock-based compensation expense  $1,835   $778 
           
Impact on basic and diluted net loss per common share  $0.01   $—   
Stock option activity
   Shares
(in thousands)
  Weighted- Average Exercise
Price
  Weighted-
Average
Remaining Contractual Term
(Years)
          
Outstanding at January 1, 2013   86,283   $0.42    8.2 
Granted   7,518   $0.74      
Exercised   (63)  $0.19      
Expired and forfeited   (4,513)  $0.29      
Outstanding at March 31, 2013   89,225   $0.45    8.5