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INCOME TAXES - Reconciliation of the Statutory U.S. Federal Tax Rate to the Effective Tax Rate (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Abstract]
Statutory U.S. federal income tax rate	35.00%	35.00%	35.00%
State income taxes, net of federal benefit	0.00%	0.50%	(0.10%)
Effect of foreign operations	(7.10%)	0.90%	15.20%
Accruals and reserves	0.10%	3.20%	0.00%
Nondeductible employee compensation	1.50%	1.50%	2.50%
Research tax credits	(0.70%)	(1.30%)	(4.40%)
Change in valuation allowance	(4.10%)	(9.70%)	8.40%
Stock based compensation	(1.90%)	0.00%	0.00%
U.S. Tax Cuts and Jobs Act	7.70%	0.00%	0.00%
Other	0.00%	(0.20%)	(1.00%)
Effective tax rate	30.50%	29.90%	55.60%

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Effective income tax rate reconciliation change in accruals and reserves percent.

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Effective income tax rate reconciliation deduction share based compensation cost percent.

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Effective income tax rate reconciliation US tax cuts and jobs act.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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