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RESTRUCTURING (Details)
3 Months Ended 6 Months Ended
Mar. 03, 2015
USD ($)
position
Jun. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Outstanding Restructuring Liability      
Restructuring charges   $ 941,000 $ 1,347,000
Non-cash stock-based compensation expense   (212,000)  
Accrual balance at the end of the period   205,000 205,000
March 2015 Restructuring      
RESTRUCTURING      
Number of positions before restructuring | position 39    
Number of positions after restructuring | position 21    
Original exercise period for vested outstanding awards after termination 90 days    
Modified exercise period for vested outstanding awards after termination 1 year    
Aggregate estimated restructuring charges $ 1,395,000    
Expected cash payments $ 1,088,000    
March 2015 Restructuring | One-time termination benefits      
Outstanding Restructuring Liability      
Restructuring charges     1,347,000
Cash payments     (840,000)
Non-cash stock-based compensation expense     (302,000)
Accrual balance at the end of the period   $ 205,000 $ 205,000