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Summary of Pro Forma Consolidated Net Sales and Income (Loss) Before Income Taxes and Equity in Earnings (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Business Acquisition [Line Items]    
Basic and diluted loss per common share $ (0.24) $ (0.70)
Filament    
Business Acquisition [Line Items]    
Net sales   $ 143,980
Loss before income taxes and equity in earnings   (15,844)
Net loss   $ (11,868)
Basic and diluted loss per common share   $ (0.58)