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INCOME TAXES - Schedule of Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
U.S. statutory income tax rate	21.00%	35.00%	35.00%
State income taxes, net of federal benefit	(0.10%)	1.20%	0.00%
Foreign income taxes	(5.70%)	(0.50%)	(7.90%)
Foreign tax audit	0.00%	0.00%	(5.20%)
Acquisition costs	(0.30%)	(6.00%)	0.00%
Foreign deemed dividends	(3.40%)	(3.80%)	(5.00%)
Stock-based compensation	(0.30%)	26.80%	(38.90%)
Tax credits	0.60%	(33.30%)	11.60%
Uncertain tax positions	1.30%	(1.20%)	0.00%
NOL and credit limitations	0.00%	(18.90%)	0.00%
Valuation allowance	(16.10%)	29.00%	(1.90%)
Goodwill amortization	0.30%	(1.70%)	(6.70%)
Meals and entertainment	(0.40%)	(0.50%)	(1.40%)
Tax reform	0.00%	8.80%	0.00%
Other, net	(1.50%)	(0.60%)	(1.60%)
Effective income tax rate	(4.60%)	34.30%	(22.00%)

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