Quarterly report pursuant to Section 13 or 15(d)

Restructuring Charges (Details)

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Restructuring Charges (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
employee
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Restructuring Charges        
Number of positions eliminated | employee   46    
Restructuring charges   $ 5,770,000   $ 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 $ 873,000 1,714,000 $ 2,928,000 5,166,000
Restructuring charges related to severance, COBRA benefits and outplacement costs $ 64,000   $ 64,000  
Restructuring charges        
Restructuring Charges        
Total stock-based compensation expense   $ 499,000   $ 499,000