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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
SEGMENT REPORTING |  |  |  |  |
Net Sales by Segment | [1] | $ 14,052 | $ 15,921 | $ 24,310 |
Net Sales by Segment (as a percent) |  | 100.00% | 100.00% | 100.00% |
China |  |  |  |  |
SEGMENT REPORTING |  |  |  |  |
Net Sales by Segment |  | $ 1,735 | $ 1,858 |  | $ 2,286
Net Sales by Segment (as a percent) |  | 12.00% | 11.00% | 10.00% |
India |  |  |  |  |
SEGMENT REPORTING |  |  |  |  |
Net Sales by Segment |  | $ 7,152 | $ 8,221 |  | 9,807
Net Sales by Segment (as a percent) |  | 51.00% | 52.00% | 40.00% |
Japan |  |  |  |  |
SEGMENT REPORTING |  |  |  |  |
Net Sales by Segment |  | $ 5,165 | $ 5,842 |  | $ 12,208
Net Sales by Segment (as a percent) |  | 37.00% | 37.00% | 50.00% |
Other |  |  |  |  |
SEGMENT REPORTING |  |  |  |  |
Net Sales by Segment |  |  |  | $ 9 |
Net Sales by Segment (as a percent) |  |  |  |  |
[1] | Revenue recognized for the years ended December 31, 2022, 2021 and 2020 that was included in deferred revenue (including current and non-current) and customer advances as of the beginning of each year was $0.3 million, $0.4 million and $1.2 million, respectively.

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