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ORGANIZATION AND DESCRIPTION OF BUSINESS (Details) $ in Thousands	2 Months Ended	12 Months Ended
	Mar. 12, 2021 USD ($)	Dec. 31, 2020 USD ($) segment patent	Dec. 31, 2019 USD ($)
Subsidiary, Sale of Stock [Line Items]
Number of operating segments \| segment		1
Accumulated deficit		$ 150,906	$ 122,492
Net loss		(28,414)	(29,928)
Cash used		23,200
Cash and cash equivalents		$ 24,968	$ 10,688
Subsequent Event
Subsidiary, Sale of Stock [Line Items]
Proceeds from issuance of common stock	$ 4,100
IP Portfolio
Subsidiary, Sale of Stock [Line Items]
Number of developed technology patents \| patent		300
IP Portfolio, XBAR Technology
Subsidiary, Sale of Stock [Line Items]
Number of developed technology patents \| patent		150