CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenues, net:
Total revenues, net	$ 92,767,000	$ 77,860,000	$ 258,145,000	$ 201,277,000
Costs of sales:
Total cost of sales	71,359,000	59,646,000	195,003,000	157,760,000
Gross margin	21,408,000	18,214,000	63,142,000	43,517,000
Operating expenses:
Selling, general and administrative	26,543,000	21,662,000	75,309,000	59,145,000
Research and development	12,843,000	10,122,000	33,785,000	24,574,000
Amortization of identifiable intangible assets	465,000	539,000	1,399,000	1,303,000
Gain on insurance proceeds	0	0	0	(4,400,000)
Total operating expenses	39,851,000	32,323,000	110,493,000	80,622,000
Operating loss	(18,443,000)	(14,109,000)	(47,351,000)	(37,105,000)
Other expense, net	(179,000)	(539,000)	(804,000)	(931,000)
Interest expense, net	(2,140,000)	(5,406,000)	(7,054,000)	(12,503,000)
Loss on extinguishment of debt	0	(11,916,000)	0	(11,916,000)
Loss before provision for income taxes	(20,762,000)	(31,970,000)	(55,209,000)	(62,455,000)
(Provision for) benefit from income taxes	(578,000)	37,000	(629,000)	12,295,000
Net loss	$ (21,340,000)	$ (31,933,000)	$ (55,838,000)	$ (50,160,000)
Net loss per share, basic (in dollars per share)	$ (0.79)	$ (1.23)	$ (2.06)	$ (2.05)
Net loss per share, diluted (in dollars per share)	$ (0.79)	$ (1.23)	$ (2.06)	$ (2.05)
Weighted average shares outstanding, basic (in shares)	27,110	25,998	27,150	24,485
Weighted average shares outstanding, diluted (in shares)	27,110	25,998	27,150	24,485
Product
Revenues, net:
Total revenues, net	$ 31,343,000	$ 30,291,000	$ 84,820,000	$ 72,786,000
Costs of sales:
Total cost of sales	25,458,000	22,786,000	69,666,000	56,158,000
Service
Revenues, net:
Total revenues, net	37,010,000	29,530,000	106,550,000	74,743,000
Costs of sales:
Total cost of sales	24,021,000	20,792,000	64,981,000	52,427,000
Contract
Revenues, net:
Total revenues, net	24,414,000	18,039,000	66,775,000	53,748,000
Costs of sales:
Total cost of sales	$ 21,880,000	$ 16,068,000	$ 60,356,000	$ 49,175,000