STOCKHOLDERS' EQUITY - Summary of warrant activity (Details) - Warrant - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Share Based Compensation Warrant Activity [Line Items]
Number of shares, Beginning	9,529,288	10,420,594
Number of shares, Issuances	16,118,750	1,043,988
Number of shares, Exercises	(102,947)	(1,935,294)
Number of shares, Forfeitures	(257,353)
Number of shares, Ending	25,287,738	9,529,288
Weighted Average exercise price, Beginning	$ 0.21	$ 0.17
Weighted Average exercise price, Issuances	0.26	0.45
Weighted Average exercise price, Exercises	0.13	0.125
Weighted Average exercise price, Forfeitures	0.37
Weighted Average exercise price, Ending	0.24	0.21
Maximum [Member]
Share Based Compensation Warrant Activity [Line Items]
Weighted Average exercise price, Beginning	0.45	0.37
Weighted Average exercise price, Issuances	0.28
Weighted Average exercise price, Ending	0.45	0.45
Minimum [Member]
Share Based Compensation Warrant Activity [Line Items]
Weighted Average exercise price, Beginning	0.125	0.125
Weighted Average exercise price, Issuances	0.24
Weighted Average exercise price, Ending	$ 0.18	$ 0.125