CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net revenues:
Revenue	$ 54,467	$ 54,732
Costs of sales:
Cost of sales	44,267	43,685
Gross margin	10,200	11,047
Operating expenses:
Selling, general and administrative	14,537	11,646
Research and development	5,809	4,865
Amortization of identifiable intangible assets	275	210
Gain on insurance proceeds	(4,400)	0
Operating expenses	16,221	16,721
Operating loss	(6,021)	(5,674)
Other expense – net	(51)	(406)
Loss on extinguishment of debt	0	(8,123)
Interest expense – net	(2,160)	(1,972)
Loss before provision for income taxes	(8,232)	(16,175)
(Provision for) benefit from income taxes	(39)	5,265
Net loss	$ (8,271)	$ (10,910)
Net loss per share, basic (in dollars per share)	$ (0.38)	$ (0.61)
Net loss per share, diluted (in dollars per share)	$ (0.38)	$ (0.61)
Weighted average shares outstanding, basic (in shares)	21,929	17,941
Weighted average shares outstanding, diluted (in shares)	21,929	17,941
Product
Net revenues:
Revenue	$ 18,556	$ 18,634
Costs of sales:
Cost of sales	14,885	14,905
Service
Net revenues:
Revenue	18,028	18,775
Costs of sales:
Cost of sales	12,695	12,646
Contract
Net revenues:
Revenue	17,883	17,323
Costs of sales:
Cost of sales	$ 16,687	$ 16,134