WARRANTS - Warrants and Rights Outstanding, Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Jul. 31, 2018
Class of Warrant or Right, Outstanding [Roll Forward]
Outstanding, beginning of period (in shares)	1,104,560
Exercises during the period (in shares)	1,150,956	0
Outstanding, end of period (in shares)	0	1,104,560
October 2015/ March 2016
Class of Warrant or Right [Line Items]
Number of warrants (in shares)	2,103,930
Exercise price (in dollars per share)	$ 0.10
Class of Warrant or Right, Outstanding [Roll Forward]
Outstanding, beginning of period (in shares)	717,225	717,225
Exercises during the period (in shares)	717,225	0
Outstanding, end of period (in shares)	0	717,225
Fair value of warrants or rights	$ 0
October 1, 2016
Class of Warrant or Right [Line Items]
Number of warrants (in shares)	157,580
Exercise price (in dollars per share)	$ 0.07
Class of Warrant or Right, Outstanding [Roll Forward]
Outstanding, beginning of period (in shares)	157,580	157,580
Exercises during the period (in shares)	157,580	0
Outstanding, end of period (in shares)	0	157,580
Fair value of warrants or rights	$ 0
July 2018
Class of Warrant or Right, Outstanding [Roll Forward]
Outstanding, beginning of period (in shares)	306,835	306,835
Exercises during the period (in shares)	276,151	0
Outstanding, end of period (in shares)	30,684	306,835
Fair value of warrants or rights	$ 15
July 2018 - Allotment 1
Class of Warrant or Right [Line Items]
Number of warrants (in shares)	122,735		122,735
Exercise price (in dollars per share)	$ 1.28		$ 1.28
July 2018 - Allotment 2
Class of Warrant or Right [Line Items]
Number of warrants (in shares)	184,100		184,100
Exercise price (in dollars per share)	$ 1.28		$ 1.28