CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Net sales	$ 456,255	$ 417,639
Cost of sales	414,984	359,191
Gross profit	41,271	58,448
Operating expenses:
Research, development and engineering expenses	22,435	25,375
Selling, general and administrative expenses	57,871	51,744
Amortization of intangible assets	2,535	3,053
Total operating expenses	82,841	80,172
Operating loss	(41,570)	(21,724)
Other expense, net:
Interest expense	7,307	5,714
Loss on debt extinguishment and modifications	0	497
Other expense (income), net	1	(1,240)
Total other expense, net	7,308	4,971
Loss before income taxes	(48,878)	(26,695)
Income tax benefit	(406)	(3,713)
Net loss	$ (48,472)	$ (22,982)
Weighted-average common shares outstanding:
Basic (in shares)	22,908	22,872
Diluted (in shares)	22,908	22,872
Loss per common share:
Basic (in dollars per share)	$ (2.12)	$ (1.00)
Diluted (in dollars per share)	$ (2.12)	$ (1.00)