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RESTRUCTURING - (Details)
 3 Months Ended 12 Months Ended 13 Months Ended
Mar. 03, 2015
USD ($)
position
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Mar. 31, 2016
USD ($)
Restructuring          
Number of positions before restructuring | position 39        
Number of positions after restructuring | position 21        
Restructuring charges     $ 406,000 $ 1,306,000  
Non-cash stock-based compensation expense     $ 90,000    
Original exercise period for vested outstanding awards after termination 90 days        
Modified exercise period for vested outstanding awards after termination 1 year        
Expected cash payments $ 999,000        
Outstanding Restructuring Liability          
Accrual balance at the beginning of the period   $ 52,000      
Cash payments   (17,000)     $ 964,000
Accrual balance at the end of the period   $ 35,000   $ 52,000 $ 35,000