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OTHER COMPREHENSIVE LOSS - Comprehensive income (loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Before Tax | $ (20) |
Tax Benefit | 0 |
Net of Tax | (20) | $ (20)
Foreign currency translation adjustments |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Before Tax | (46) |
Tax Benefit | 0 |
Net of Tax | (46) | (46)
Unrealized loss on marketable securities |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Before Tax | 26 |
Tax Benefit | 0 |
Net of Tax | $ 26 | $ 26

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