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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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