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Restructuring and Impairment Charges (Components of Restructuring and Impairment Charges) (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]    
Impairment charge for leasehold improvements and equipment $ 1,381,000  
Employee severance and retention 1,332,000  
Other charges related to facility closure 582,000  
Lease termination gain (2,445,000)  
Goodwill impairment 21,521,000  
Total restructuring and impairment charges 22,371,000 $ 0
Manufacturing [Member]    
Restructuring Cost and Reserve [Line Items]    
Total restructuring and impairment charges $ 22,371,000