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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Business Acquisition [Line Items]        
Basic and diluted loss per common share $ (0.56) $ (0.30) $ (0.80) $ (0.96)
Filament        
Business Acquisition [Line Items]        
Net sales   $ 148,651   $ 292,631
Loss before income taxes and equity in earnings   (6,694)   (22,904)
Net loss   $ (5,092)   $ (17,235)
Basic and diluted loss per common share   $ (0.25)   $ (0.85)