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GEOGRAPHIC AND SEGMENT INFORMATION - Reportable Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting Information [Line Items]        
Sales $ 11,831 $ 6,954 $ 31,693 $ 16,247
Income (loss) from operations (3,968) (4,371) (12,756) (18,030)
Interest income 2 10 9 233
Interest expense (3) (25) (9) (39)
Other income (loss), net (192) (63) (188) 349
Income tax (benefit) expense 73 (715) 246 (7,112)
Operating Segments | Advanced Energy        
Segment Reporting Information [Line Items]        
Sales 10,313 5,479 27,951 12,332
Income (loss) from operations 52 (1,095) (224) (8,371)
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 1,518 1,475 3,742 3,915
Income (loss) from operations 328 556 588 1,387
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 (4,348) (3,832) (13,120) (11,046)
Interest income 2 10 9 233
Interest expense (3) (25) (9) (39)
Other income (loss), net (192) (63) (188) 349
Income tax (benefit) expense $ 73 $ (715) $ 246 $ (7,112)