ORGANIZATION AND DESCRIPTION OF BUSINESS (Liquidity and Capital Resources) (Details) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020 USD ($) Patent	Mar. 31, 2020 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Jun. 30, 2020 USD ($) Patent	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Subsidiary, Sale of Stock [Line Items]
Accumulated deficit	$ 137,712				$ 137,712		$ 122,492
Net loss	(7,215)	$ (8,005)	$ (7,498)	$ (7,137)	(15,220)	$ (14,635)
Substantial doubt about going concern, management's evaluation, cash used in the period					(13,200)
Cash and cash equivalents	$ 23,873		$ 6,065		$ 23,873	$ 6,065	$ 10,688
IP Portfolio
Subsidiary, Sale of Stock [Line Items]
Number of Developed Technology Patents | Patent	240				240
IP Portfolio, XBAR Technology
Subsidiary, Sale of Stock [Line Items]
Number of Developed Technology Patents | Patent	80				80