FAIR VALUE MEASUREMENT - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
FAIR VALUE MEASURMENTS [Abstract]
Currency hedging cost for a year	$ 0
Currency hedging transactions, maximum term	1 year
Total hedged amount	$ 0
Foreign exchange risk lien on marketable securities for bank guarantees granted to secure hedging transactions	281
Foreign exchange risk lien on checking account for bank guarantees granted to secure hedging transactions	$ 250