STOCKHOLDERS' EQUITY (Schedule of RSU Activity) (Details) - Restricted Stock Units (RSUs) [Member] - Employees and Members of Board of Directors [Member]	9 Months Ended
	Sep. 30, 2020 $ / shares shares
Number of RSUs
Unvested as of December 31, 2019 | shares	2,742,589
Granted | shares	606,666
Vested | shares	(807,986)
Forfeited | shares	(166,461)
Unvested as of September 30, 2020 | shares	2,374,808
Weighted average grant date fair value
Unvested as of December 31, 2019 | $ / shares	$ 52.77
Granted | $ / shares	180.66
Vested | $ / shares	43.34
Forfeited | $ / shares	65.30
Unvested as of September 30, 2020 | $ / shares	$ 87.78