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RESTRUCTURING - (Details)
 3 Months Ended 9 Months Ended 12 Months Ended 19 Months Ended
Mar. 03, 2015
USD ($)
position
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2016
USD ($)
Restructuring            
Number of positions before restructuring | position 39          
Number of positions after restructuring | position 21          
Restructuring charges   $ (41,000)   $ 1,306,000 $ 1,306,000  
Non-cash stock-based compensation expense   5,000   307,000    
Non-cash adjustment to restructuring charges   89,000   89,000    
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     (39,000)     $ (986,000)
Accrual balance at the end of the period     $ 13,000   $ 52,000 $ 13,000
One-time termination benefits            
Restructuring            
Restructuring charges   $ 48,000   $ 1,395,000