CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net revenues:
Revenue	$ 213,786	$ 187,232	$ 201,246
Costs of sales:
Costs of sales	174,461	149,821	163,727
Gross margin	39,325	37,411	37,519
Operating expenses:
Selling, general and administrative	46,196	38,068	35,810
Research and development	19,252	13,372	12,412
Amortization of identifiable intangible assets	1,163	156	22
Adjustment to contingent consideration liability	(3,340)	0	(450)
Operating expenses	63,271	51,596	47,794
Operating loss	(23,946)	(14,185)	(10,275)
Other income (expense) – net	808	(449)	683
Loss on extinguishment of debt	(8,123)	0	0
Interest expense – net	(8,287)	(4,571)	(387)
Loss before benefit from (provision for) income taxes	(39,548)	(19,205)	(9,979)
Benefit from (provision for) income taxes	2,986	3,634	(14,143)
Net loss	$ (36,562)	$ (15,571)	$ (24,122)
Net loss per share (basic and diluted) (in dollars per share)	$ (1.92)	$ (0.96)	$ (1.50)
Weighted average shares outstanding (basic and diluted) (in shares)	19,014	16,223	16,041
Product
Net revenues:
Revenue	$ 73,228	$ 66,329	$ 78,787
Costs of sales:
Costs of sales	58,887	51,189	60,694
Service
Net revenues:
Revenue	69,284	56,978	55,282
Costs of sales:
Costs of sales	49,933	40,389	43,051
Contract
Net revenues:
Revenue	71,274	63,925	67,177
Costs of sales:
Costs of sales	$ 65,641	$ 58,243	$ 59,982