STOCKHOLDERS' EQUITY (Convertible Promissory Note Warrants) (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Feb. 29, 2020	Aug. 31, 2017
Class of Stock [Line Items]
Deemed dividend		$ 0	$ 0	$ 0	$ 3,344
Convertible Promissory Note Warrants
Class of Stock [Line Items]
Exercise price (in dollars per share)	$ 0.40					$ 2.25	$ 45.00
Maximum | Convertible Promissory Note Warrants | Deemed Dividend D
Class of Stock [Line Items]
Deemed dividend	$ 1