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OTHER COMPREHENSIVE LOSS - Comprehensive income (loss) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	$ (538)
Tax Benefit	0
Net of Tax	(538)	$ (538)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	(560)
Tax Benefit	0
Net of Tax	(560)	(560)
Unrealized loss on marketable securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	22
Tax Benefit	0
Net of Tax	$ 22	$ 22

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Amount before tax, after reclassification adjustments of other comprehensive income (loss).

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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