Annual report pursuant to Section 13 and 15(d)

RESTRUCTURING CHARGES (Details)

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RESTRUCTURING CHARGES (Details)
1 Months Ended 12 Months Ended
Sep. 30, 2016
employee
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Restructuring Charges        
Number of positions eliminated | employee 46      
Restructuring charges   $ 5,770,000    
Restructuring charges paid or to be paid in cash   5,000,000    
Restructuring, asset impairment charges   319,000    
Total stock-based compensation expense   7,832,000 $ 7,403,000 $ 9,787,000
Restructuring charges related to severance, COBRA benefits and outplacement costs   712,000    
Restructuring charge        
Restructuring Charges        
Total stock-based compensation expense   $ 499,000