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INCOME TAXES - Schedule of Reconciliation of Effective Income Tax Rate and Federal Statutory Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of effective income tax rate and the federal statutory rate
Federal tax (benefit) at statutory rate	$ (858)	$ 1,120	$ 2,885
Stock based compensation expense	132	184	295
Effect of differences in foreign tax rates	547	2,113	(6,793)
FIN48 reserve	(349)	(1,230)	(1,478)
Change in deferred tax valuation allowance	1,107	(1,679)	5,971
Other	(610)	(886)	383
Total income tax expense (benefit)	$ (31)	$ (378)	$ 1,263

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax expense (benefit).

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Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for award under share-based payment arrangement. Includes, but is not limited to, expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to repatriation of foreign earnings.

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