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Summary of Pro Forma Consolidated Net Sales and Income (Loss) Before Income Taxes and Equity in Earnings (Detail) - Filament - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Business Acquisition [Line Items]        
Net sales $ 148,651 $ 149,043 $ 292,631 $ 307,313
Loss before income taxes and equity in earnings (6,694) (6,193) (22,904) (11,245)
Net loss $ (5,092) $ (3,295) $ (17,235) $ (5,935)
Basic and diluted loss per common share $ (0.25) $ (0.16) $ (0.85) $ (0.30)