Quarterly report pursuant to Section 13 or 15(d)

Restructuring and Other Related Costs - Components of Restructuring and Other Related Costs (Details)

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Restructuring and Other Related Costs - Components of Restructuring and Other Related Costs (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Restructuring Cost and Reserve        
Restructuring and other related costs $ 10,000 $ 276,000 $ 130,000 $ 1,472,000
Restructuring charges     107,000  
Other related costs        
Restructuring Cost and Reserve        
Restructuring and other related costs 10,000 276,000 23,000 642,000
Legacy Eco Restructuring Plan        
Restructuring Cost and Reserve        
Restructuring charges     0  
Legacy Eco Restructuring Plan | Employee Severance        
Restructuring Cost and Reserve        
Restructuring and other related costs 0 0 0 830,000
Performance Materials Plant Closure        
Restructuring Cost and Reserve        
Restructuring charges     107,000  
Performance Materials Plant Closure | Employee Severance        
Restructuring Cost and Reserve        
Restructuring and other related costs 0 $ 0 $ 107,000 $ 0
Restructuring charges $ 0