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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
SEGMENT REPORTING |  |  |  |
Net Sales by Segment | [1] | $ 15,753 | $ 14,052 | $ 15,921
Net Sales by Segment (as a percent) |  | 100.00% | 100.00% | 100.00%
Gross profit (loss) by Segment |  | $ 4,390 | $ 2,667 | $ (1,075)
Gross profit (loss) by Segment (as a percent) |  | 28.00% | 19.00% | (7.00%)
Loss before income taxes |  | $ (2,577) | $ (2,939) | $ (2,534)
Operating segments |  |  |  |
SEGMENT REPORTING |  |  |  |
Total segment loss |  | (1,204) | (3,167) | (9,585)
Operating segments | Equipment |  |  |  |
SEGMENT REPORTING |  |  |  |
Net Sales by Segment |  | $ 4,594 | $ 2,284 | $ 2,323
Net Sales by Segment (as a percent) |  | 29.00% | 16.00% | 15.00%
Gross profit (loss) by Segment |  | $ 928 | $ (618) | $ (4,358)
Gross profit (loss) by Segment (as a percent) |  | 20.00% | (27.00%) | (188.00%)
Total segment loss |  | $ (4,666) | $ (6,452) | $ (12,868)
Operating segments | Services |  |  |  |
SEGMENT REPORTING |  |  |  |
Net Sales by Segment |  | $ 11,159 | $ 11,768 | $ 13,598
Net Sales by Segment (as a percent) |  | 71.00% | 84.00% | 85.00%
Gross profit (loss) by Segment |  | $ 3,462 | $ 3,285 | $ 3,283
Gross profit (loss) by Segment (as a percent) |  | 31.00% | 28.00% | 24.00%
Total segment loss |  | $ 3,462 | $ 3,285 | $ 3,283
General and Corporate |  |  |  |
SEGMENT REPORTING |  |  |  |
General and corporate |  | $ (1,373) | $ 228 | $ 7,051
[1] | Revenue recognized for the years ended December 31, 2023, 2022 and 2021 that was included in deferred revenue (including current and non-current) and customer advances as of the beginning of each year was $0.1 million, $0.3 million and $0.4 million, respectively.

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