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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Revenue $ 103,978 $ 125,389
Cost of sales 78,866 94,645
Gross profit 25,112 30,744
Research and development costs 6,059 7,184
Selling, general and administrative expenses 22,062 19,225
Restructuring charges 128 946
(Loss) income from operations (3,137) 3,389
Interest expense (1,351) (1,440)
Other income/expense, net (88) (779)
(Loss) earnings before (benefit from) provision for income taxes (4,576) 1,170
(Benefit from) provision for income taxes (772) 39
Net (loss) earnings available to common stockholders (3,804) 1,131
Common Class A [Member]    
Net (loss) earnings available to common stockholders $ (649) $ 180
Net (loss) earnings per common share:    
Common shares - basic and diluted (in dollars per share) $ (0.30) $ 0.08
Weighted-average number of shares outstanding:    
Common shares - basic and diluted (in shares) 2,145 2,175
Common Class B [Member]    
Net (loss) earnings available to common stockholders $ (3,155) $ 951
Net (loss) earnings per common share:    
Common shares - basic and diluted (in dollars per share) $ (0.31) $ 0.09
Weighted-average number of shares outstanding:    
Common shares - basic and diluted (in shares) 10,123 10,089