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INCOME TAXES - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Line Items]
Net operating loss carry forwards	$ 3,405	$ 3,716
Current income tax expense	$ 12,902	10,224	$ 8,363
Withholding tax rate for royalty payments	16.50%
U.S. Foreign Tax Credits [Member]
Income Taxes [Line Items]
U.S. foreign tax credits valuation allowance	$ 6,500
ASU No. 2016-09 [Member]
Income Taxes [Line Items]
Adjustment to retained earnings due to adoption of accounting standard	26,900
Foreign [Member]
Income Taxes [Line Items]
Net operating loss carry forwards	3,434
State [Member]
Income Taxes [Line Items]
Tax credit carryforwards, research	1,846
South Korea [Member]
Income Taxes [Line Items]
Current income tax expense	$ 12,400	$ 9,900	$ 8,300

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Income taxes.

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The withholding tax rate for royalty payments made by Samsung Mobile Display Co., Ltd. (SMD).

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Amount of current foreign income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount of valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from tax credit carryforwards for which it is more likely than not that a tax benefit will not be realized.

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