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GEOGRAPHIC AND SEGMENT INFORMATION - Reportable Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Segment Reporting Information [Line Items]    
Sales $ 10,244 $ 12,142
(Loss) income from operations (6,615) (5,611)
Interest income 495 51
Interest expense (1,396) (234)
Other loss, net (21) (5)
Income tax (benefit) expense 53 (2,267)
Operating Segments | Advanced Energy    
Segment Reporting Information [Line Items]    
Sales 7,453 9,690
(Loss) income from operations (2,940) (1,476)
Interest income 0 0
Interest expense 0 0
Other loss, net 0 0
Income tax (benefit) expense 0 0
Operating Segments | OEM    
Segment Reporting Information [Line Items]    
Sales 2,791 2,452
(Loss) income from operations 732 851
Interest income 0 0
Interest expense 0 0
Other loss, net 0 0
Income tax (benefit) expense 0 0
Corporate & Other    
Segment Reporting Information [Line Items]    
Sales 0 0
(Loss) income from operations (4,407) (4,986)
Interest income 495 51
Interest expense (1,396) (234)
Other loss, net (21) (5)
Income tax (benefit) expense $ 53 $ (2,267)