CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Net sales	$ 181,680	$ 175,764	$ 566,809	$ 458,275
Costs and expenses:
Cost of goods sold	145,680	129,769	441,882	353,629
Selling, general and administrative	28,481	24,414	89,237	81,610
Gain on disposal of Canton Facility, net			(30,718)
Design and development	16,447	11,754	46,593	36,373
Operating income	(8,928)	9,827	19,815	(13,337)
Interest expense, net	1,447	1,882	5,073	4,322
Equity in loss (earnings) of investee	(584)	(330)	(1,694)	(556)
Other income , net	41	(253)	127	(1,879)
(Loss) income before income taxes	(9,832)	8,528	16,309	(15,224)
(Benefit) provision for income taxes	526	1,814	6,739	(3,694)
Net (loss) income	$ (10,358)	$ 6,714	$ 9,570	$ (11,530)
(Loss) earnings per share:
Basic (in dollars per share)	$ (0.38)	$ 0.25	$ 0.35	$ (0.43)
Diluted (in dollars per share)	$ (0.38)	$ 0.25	$ 0.35	$ (0.43)
Weighted-average shares outstanding:
Basic (in shares)	27,147,150	26,956,286	27,100,484	27,046,899
Diluted (in shares)	27,147,150	27,222,882	27,431,518	27,046,899