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SEGMENT REPORTING - Summary of the Company's Segment Net Sales, Gross Profit and Segment Margin (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
SEGMENT REPORTING      
Net sales [1] $ 10,878 $ 15,753 $ 14,052
Cost of Net Sales (7,972) (11,363) (11,385)
Gross Profit (Loss) 2,906 4,390 2,667
Research and Development (5,085) (5,881) (4,762)
Loss before income taxes (3,685) (2,577) (2,939)
Operating segments | Equipment      
SEGMENT REPORTING      
Net sales 1,406 4,594 2,284
Cost of Net Sales (1,223) (3,666) (2,902)
Gross Profit (Loss) 183 928 (618)
Research and Development (5,085) (5,881) (4,762)
Operating segments | Services      
SEGMENT REPORTING      
Net sales 9,472 11,159 11,768
Cost of Net Sales (6,749) (7,697) (8,483)
Gross Profit (Loss) 2,723 3,462 3,285
General and Corporate      
SEGMENT REPORTING      
General and corporate $ (1,506) $ (1,086) $ (844)
[1] Revenue recognized for the years ended December 31, 2024, 2023 and 2022 that was included in deferred revenue (including current and non-current) and customer advances as of the beginning of each year was $0.1 million, $0.1 million and $0.3 million, respectively.