CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SALES
Sales	$ 337,814	$ 303,768	$ 381,765
COST OF SALES
Total cost of sales	153,887	143,921	183,633
GROSS PROFIT	183,927	159,847	198,132
OPERATING EXPENSES
Selling, general and administrative	136,234	131,827	177,378
Research and development	48,761	42,896	44,175
Restructuring costs	7,368	15,806	0
Impairment loss	0	0	35,213
Total operating expenses	192,363	190,529	256,766
LOSS FROM OPERATIONS	(8,436)	(30,682)	(58,634)
OTHER EXPENSE (INCOME)
Interest income	0	(340)	(714)
Other expense, net	70	431	2,313
Interest expense	55	0	781
LOSS BEFORE INCOME TAX EXPENSE (BENEFIT)	(8,561)	(30,773)	(61,014)
INCOME TAX EXPENSE (BENEFIT)	31,403	(31,402)	1,133
NET (LOSS) INCOME	$ (39,964)	$ 629	$ (62,147)
NET (LOSS) INCOME PER SHARE - BASIC (in dollars per share)	$ (2.20)	$ 0.04	$ (3.58)
NET (LOSS) INCOME PER SHARE - DILUTED (in dollars per share)	$ (2.20)	$ 0.04	$ (3.58)
Weighted average shares - Basic (in shares)	18,187,946	17,769,958	17,383,415
Weighted average shares - Diluted (in shares)	18,187,946	17,926,324	17,383,415
Product
SALES
Sales	$ 251,103	$ 218,587	$ 289,679
COST OF SALES
Total cost of sales	109,024	98,864	133,246
Service
SALES
Sales	86,711	85,181	92,086
COST OF SALES
Total cost of sales	$ 44,863	$ 45,057	$ 50,387