OTHER INCOME, NET (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017		Sep. 30, 2018	Sep. 30, 2017
Other Income and Expenses [Abstract]
Interest income, net	$ 3,705	$ 991		$ 9,606	$ 2,431
Transaction gain on foreign exchange	75	323		89	377
Other non-operating income, net	141	57		255	125
Other income, net	$ 3,921	$ 1,371	[1]	$ 9,950	$ 2,933	[1]

[1] As of January 1, 2018, the Company adopted ASC 606 using the full retrospective method. Accordingly, the Company has recast certain amounts in the prior periods presented. See Note 1 below for additional discussion.