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SEGMENT REPORTING - Schedule of Sales Data by Geographical Area (Details) - USD ($) $ in Thousands | 12 Months Ended
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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%
China |  |  |  |
SEGMENT REPORTING |  |  |  |
Net Sales by Segment |  | $ 2,577 | $ 1,735 | $ 1,858
Net Sales by Segment (as a percent) |  | 16.00% | 12.00% | 11.00%
India |  |  |  |
SEGMENT REPORTING |  |  |  |
Net Sales by Segment |  | $ 8,268 | $ 7,152 | $ 8,221
Net Sales by Segment (as a percent) |  | 53.00% | 51.00% | 52.00%
Japan |  |  |  |
SEGMENT REPORTING |  |  |  |
Net Sales by Segment |  | $ 4,908 | $ 5,165 | $ 5,842
Net Sales by Segment (as a percent) |  | 31.00% | 37.00% | 37.00%
[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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