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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
SEGMENT REPORTING |  |  |  |
Net Sales by Segment | [1] | $ 24,310 | $ 65,623 | $ 115,944
Net Sales by Segment (as a percent) |  | 100.00% | 100.00% | 100.00%
China |  |  |  |
SEGMENT REPORTING |  |  |  |
Net Sales by Segment |  | $ 2,286 | $ 2,439 | $ 3,146
Net Sales by Segment (as a percent) |  | 10.00% | 4.00% | 3.00%
India |  |  |  |
SEGMENT REPORTING |  |  |  |
Net Sales by Segment |  | $ 9,807 | $ 37,206 | $ 70,106
Net Sales by Segment (as a percent) |  | 40.00% | 57.00% | 60.00%
Japan |  |  |  |
SEGMENT REPORTING |  |  |  |
Net Sales by Segment |  | $ 12,208 | $ 21,761 | $ 35,504
Net Sales by Segment (as a percent) |  | 50.00% | 33.00% | 31.00%
Taiwan |  |  |  |
SEGMENT REPORTING |  |  |  |
Net Sales by Segment |  |  | $ 3,515 | $ 6,445
Net Sales by Segment (as a percent) |  |  | 5.00% | 5.00%
Other |  |  |  |
SEGMENT REPORTING |  |  |  |
Net Sales by Segment |  | $ 9 | $ 702 | $ 743
Net Sales by Segment (as a percent) |  |  | 1.00% | 1.00%
[1] | Revenue recognized in the years ended December 31, 2020, 2019 and 2018 that was included in deferred revenue (including current and non-current) and customer advances as of the beginning of each respective period was $1.2 million, $2.8 million and $4.0 million, respectively.

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