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GEOGRAPHIC AND SEGMENT INFORMATION - Reportable Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Segment Reporting Information [Line Items]          
Sales $ 11,976 $ 9,114 $ 37,687 $ 31,899  
(Loss) income from operations (4,637) (5,782) (11,483) (17,629) $ (23,600)
Interest income 248 73 478 93  
Interest expense (585) (1) (1,362) (12)  
Other income (loss), net (19) (35) 622 551  
Income tax (benefit) expense (318) 50 (2,519) 216  
Operating Segments | Advanced Energy          
Segment Reporting Information [Line Items]          
Sales 9,836 7,080 31,248 26,258  
(Loss) income from operations 70 (1,174) (509) (3,765)  
Interest income 0 0 0 0  
Interest expense 0 0 0 0  
Other income (loss), net 0 0 0 0  
Income tax (benefit) expense 0 0 0 0  
Operating Segments | OEM          
Segment Reporting Information [Line Items]          
Sales 2,140 2,034 6,439 5,641  
(Loss) income from operations 591 356 1,795 1,142  
Interest income 0 0 0 0  
Interest expense 0 0 0 0  
Other income (loss), net 0 0 0 0  
Income tax (benefit) expense 0 0 0 0  
Corporate & Other          
Segment Reporting Information [Line Items]          
Sales 0 0 0 0  
(Loss) income from operations (5,298) (4,964) (12,769) (15,006)  
Interest income 248 73 478 93  
Interest expense (585) (1) (1,362) (12)  
Other income (loss), net (19) (35) 622 551  
Income tax (benefit) expense $ (318) $ 50 $ (2,519) $ 216