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INCOME TAXES - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Income Taxes [Line Items]
Effective income tax rate expense, percent	16.20%	14.60%	16.10%	8.90%
Income tax expense (benefit)	$ 8,386,000	$ 1,851,000	$ 14,385,000	$ 1,635,000
Long-term asset	79,220,000		79,220,000		$ 64,526,000
Korean Government [Member]
Income Taxes [Line Items]
Estimated settlement amounts due (refunds) from withholding taxes					(36,900,000)
U.S.Federal Government [Member]
Income Taxes [Line Items]
Estimated settlement amounts due (refunds) from withholding taxes					16,200,000
KNTS [Member]
Income Taxes [Line Items]
Income tax withholding and interest			13,200,000
Reduction of Korean Withholding Taxes [Member]
Income Taxes [Line Items]
Reduction of deferred tax asset for foreign tax credits and R&D			20,700,000		$ 20,700,000
Allocation of Withholding to Non-Korean Patents [Member]
Income Taxes [Line Items]
Long-term asset	20,200,000		20,200,000
Allocation of Withholding on Korean Patents [Member]
Income Taxes [Line Items]
Income tax expense (benefit)			2,100,000
ASU No. 2016-09 [Member]
Income Taxes [Line Items]
Income tax expense (benefit)	$ 1,400,000	$ 448,000	$ 2,800,000	$ 1,700,000

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Income taxes.

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