SHORT TERM DEPOSITS (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Cash and Cash Equivalents [Line Items]
Maturity of short term deposits	12 months	12 months
Minimum
Cash and Cash Equivalents [Line Items]
Annual interest rate on bank deposits	0.15%	0.15%
Maximum
Cash and Cash Equivalents [Line Items]
Annual interest rate on bank deposits	0.83%	0.83%