SEGMENTS AND GEOGRAPHIC INFORMATION (Details) $ in Thousands	3 Months Ended
Mar. 31, 2021 USD ($) segment	Mar. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments \| segment	1
Revenues	$ 608	$ 544
Japan
Segment Reporting Information [Line Items]
Revenues	494	501
China
Segment Reporting Information [Line Items]
Revenues	93	36
Other
Segment Reporting Information [Line Items]
Revenues	$ 21	$ 7

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details