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GEOGRAPHIC AND SEGMENT INFORMATION - Reportable Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Sales $ 12,142 $ 12,493  
Income (loss) from operations (5,611) (5,871) $ (23,600)
Interest income 51 2  
Interest expense (234) (8)  
Other income (loss), net (5) (21)  
Income tax (benefit) expense (2,267) 70  
Operating Segments | Advanced Energy      
Segment Reporting Information [Line Items]      
Sales 9,690 10,814  
Income (loss) from operations (1,326) (1,339)  
Interest income 0 0  
Interest expense 0 0  
Other income (loss), net 0 0  
Income tax (benefit) expense 0 0  
Operating Segments | OEM      
Segment Reporting Information [Line Items]      
Sales 2,452 1,679  
Income (loss) from operations 851 317  
Interest income 0 0  
Interest expense 0 0  
Other income (loss), net 0 0  
Income tax (benefit) expense 0 0  
Corporate & Other      
Segment Reporting Information [Line Items]      
Sales 0 0  
Income (loss) from operations (5,136) (4,849)  
Interest income 51 2  
Interest expense (234) (8)  
Other income (loss), net (5) (21)  
Income tax (benefit) expense $ (2,267) $ 70