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SEGMENT REPORTING - Summary of the Company's Segment Net Sales, Gross Profit and Segment Margin (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
SEGMENT REPORTING      
Net Sales by Segment [1] $ 15,921 $ 24,310 $ 65,623
Net Sales by Segment (as a percent) 100.00% 100.00% 100.00%
Gross profit (loss) by Segment $ (1,075) $ 3,529 $ 24,157
Gross profit (loss) by Segment (as a percent) (7.00%) 15.00% 37.00%
Loss before income taxes $ (2,534) $ (25,458) $ (3,944)
Operating segments      
SEGMENT REPORTING      
Total segment income (loss) (9,585) (5,348) 10,052
Operating segments | Equipment      
SEGMENT REPORTING      
Net Sales by Segment $ 2,323 $ 12,385 $ 43,722
Net Sales by Segment (as a percent) 15.00% 51.00% 67.00%
Gross profit (loss) by Segment $ (4,358) $ 1,237 $ 14,156
Gross profit (loss) by Segment (as a percent) (188.00%) 10.00% 32.00%
Total segment income (loss) $ (12,868) $ (7,640) $ 51
Operating segments | Services      
SEGMENT REPORTING      
Net Sales by Segment $ 13,598 $ 11,925 $ 21,901
Net Sales by Segment (as a percent) 85.00% 49.00% 33.00%
Gross profit (loss) by Segment $ 3,283 $ 2,292 $ 10,001
Gross profit (loss) by Segment (as a percent) 24.00% 19.00% 46.00%
Total segment income (loss) $ 3,283 $ 2,292 $ 10,001
General and Corporate      
SEGMENT REPORTING      
General and corporate $ 7,051 $ (20,110) $ (13,996)
[1] Revenue recognized for the years ended December 31, 2021, 2020 and 2019 that was included in deferred revenue (including current and non-current) and customer advances as of the beginning of each year was $0.4 million, $1.2 million and $2.8 million, respectively.