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SIGNIFICANT CUSTOMERS, CONCENTRATION OF CREDIT RISK AND GEOGRAPHIC INFORMATION (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021 USD ($) segment customer	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) customer
SIGNIFICANT CUSTOMERS, CONCENTRATION OF CREDIT RISK AND GEOGRAPHIC INFORMATION
Number of operating segments | segment	1
Revenue, net	$ 1,568	$ 1,691
Allowance for doubtful accounts	$ 0		$ 0
Net revenue | Customer Concentration Risk | Customer A
SIGNIFICANT CUSTOMERS, CONCENTRATION OF CREDIT RISK AND GEOGRAPHIC INFORMATION
Concentration risk (as a percent)	29.00%	11.00%
Net revenue | Customer Concentration Risk | Customer B
SIGNIFICANT CUSTOMERS, CONCENTRATION OF CREDIT RISK AND GEOGRAPHIC INFORMATION
Concentration risk (as a percent)	17.00%	10.00%
Net revenue | Customer Concentration Risk | Customer C
SIGNIFICANT CUSTOMERS, CONCENTRATION OF CREDIT RISK AND GEOGRAPHIC INFORMATION
Concentration risk (as a percent)		24.00%
Net revenue | Geographic Concentration Risk
SIGNIFICANT CUSTOMERS, CONCENTRATION OF CREDIT RISK AND GEOGRAPHIC INFORMATION
Revenue, net	$ 1,568	$ 1,691
Net revenue | Geographic Concentration Risk | United states
SIGNIFICANT CUSTOMERS, CONCENTRATION OF CREDIT RISK AND GEOGRAPHIC INFORMATION
Revenue, net	270	742
Net revenue | Geographic Concentration Risk | Asia and Middle East
SIGNIFICANT CUSTOMERS, CONCENTRATION OF CREDIT RISK AND GEOGRAPHIC INFORMATION
Revenue, net	1,112	771
Net revenue | Geographic Concentration Risk | Europe and other
SIGNIFICANT CUSTOMERS, CONCENTRATION OF CREDIT RISK AND GEOGRAPHIC INFORMATION
Revenue, net	$ 186	$ 178
Accounts receivable | Credit Concentration Risk
SIGNIFICANT CUSTOMERS, CONCENTRATION OF CREDIT RISK AND GEOGRAPHIC INFORMATION
Number of customers | customer	2		2
Accounts receivable | Credit Concentration Risk | Customer One
SIGNIFICANT CUSTOMERS, CONCENTRATION OF CREDIT RISK AND GEOGRAPHIC INFORMATION
Concentration risk (as a percent)	46.00%
Accounts receivable | Credit Concentration Risk | Customer Two
SIGNIFICANT CUSTOMERS, CONCENTRATION OF CREDIT RISK AND GEOGRAPHIC INFORMATION
Concentration risk (as a percent)	12.00%
Accounts receivable | Credit Concentration Risk | Customer Three
SIGNIFICANT CUSTOMERS, CONCENTRATION OF CREDIT RISK AND GEOGRAPHIC INFORMATION
Concentration risk (as a percent)			47.00%
Accounts receivable | Credit Concentration Risk | Customer Four
SIGNIFICANT CUSTOMERS, CONCENTRATION OF CREDIT RISK AND GEOGRAPHIC INFORMATION
Concentration risk (as a percent)			22.00%
Assets | Geographic Concentration Risk
SIGNIFICANT CUSTOMERS, CONCENTRATION OF CREDIT RISK AND GEOGRAPHIC INFORMATION
Total long-lived assets	$ 1,427		$ 1,526
Assets | Geographic Concentration Risk | United states
SIGNIFICANT CUSTOMERS, CONCENTRATION OF CREDIT RISK AND GEOGRAPHIC INFORMATION
Total long-lived assets	1,154		1,194
Assets | Geographic Concentration Risk | Asia
SIGNIFICANT CUSTOMERS, CONCENTRATION OF CREDIT RISK AND GEOGRAPHIC INFORMATION
Total long-lived assets	$ 273		$ 332

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