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GEOGRAPHIC AND SEGMENT INFORMATION - Reportable Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Segment Reporting Information [Line Items]        
Sales $ 12,149 $ 13,569 $ 22,393 $ 25,711
(Loss) income from operations (5,547) (1,235) (12,162) (6,846)
Interest income 439 179 934 230
Interest expense (1,427) (543) (2,823) (777)
Other loss, net (1) 646 (22) 641
Income tax expense (benefit) 50 66 103 (2,201)
Operating Segments | Advanced Energy        
Segment Reporting Information [Line Items]        
Sales 9,766 11,722 17,219 21,412
(Loss) income from operations (1,696) 589 (4,636) (887)
Interest income 0 0 0 0
Interest expense 0 0 0 0
Other loss, net 0 0 0 0
Income tax expense (benefit) 0 0 0 0
Operating Segments | OEM        
Segment Reporting Information [Line Items]        
Sales 2,383 1,847 5,174 4,299
(Loss) income from operations 461 353 1,193 1,204
Interest income 0 0 0 0
Interest expense 0 0 0 0
Other loss, net 0 0 0 0
Income tax expense (benefit) 0 0 0 0
Corporate & Other        
Segment Reporting Information [Line Items]        
Sales 0 0 0 0
(Loss) income from operations (4,312) (2,177) (8,719) (7,163)
Interest income 439 179 934 230
Interest expense (1,427) (543) (2,823) (777)
Other loss, net (1) 646 (22) 641
Income tax expense (benefit) $ 50 $ 66 $ 103 $ (2,201)