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GEOGRAPHIC AND SEGMENT INFORMATION - Reportable Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Sales $ 11,224 $ 4,296 $ 19,862 $ 9,293
Income (loss) from operations (4,043) (6,167) (8,788) (13,659)
Interest income 4 7 7 223
Interest expense (2) (8) (6) (14)
Other income (loss), net 97 (14) 4 412
Income tax (benefit) expense 107 (1,492) 173 (6,397)
Operating Segments | Advanced Energy        
Segment Reporting Information [Line Items]        
Sales 9,978 2,867 17,638 6,853
Income (loss) from operations 326 (3,292) (276) (7,276)
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 1,246 1,429 2,224 2,440
Income (loss) from operations 263 584 260 831
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
Income (loss) from operations (4,632) (3,459) (8,772) (7,214)
Interest income 4 7 7 223
Interest expense (2) (8) (6) (14)
Other income (loss), net 97 (14) 4 412
Income tax (benefit) expense $ 107 $ (1,492) $ 173 $ (6,397)