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(5) STOCK-BASED COMPENSATION (Tables)
9 Months Ended
Sep. 30, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-based compensation expense
   Three Months Ended  Nine Months Ended
   September 30,  September 30,
   2012  2011  2012  2011
             
Operating expenses:                    
Research and development  $397   $324   $1,061   $473 
General and administrative   1,583    427    2,712    624 
Total stock-based compensation expense  $1,980   $751   $3,773   $1,097 
                     
Impact on basic and diluted net loss per common share  $0.01   $—     $0.02   $0.01 
Schedule of share-based compensation
   Shares
(in thousands)
  Weighted- Average Exercise Price  Weighted- Average Remaining Contractual Term (Years)
          
Outstanding at January 1, 2012   50,106   $0.31    9.42 
Granted   18,950   $0.58      
Exercised   —             
Expired and forfeited   (1,116)  $0.83      
Outstanding at September 30, 2012   67,940   $0.37    8.02