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INCOME TAXES (Other - Narrative) (Details) $ in Thousands			12 Months Ended
	Oct. 11, 2014	Jan. 01, 2008	Dec. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
INCOME TAXES
Statutory tax rate (as a percent)			21.00%	35.00%
Change in deferred tax valuation allowance			$ (1,679)	$ 5,971	$ (3,015)
Income tax benefit related to tax credits			$ 0	$ 0	$ 0
China
INCOME TAXES
Foreign statutory tax rate (as a percent)			25.00%
Reduced tax rate for qualified high technology enterprises (as a percent)			15.00%
China | U T Starcom Telecom Co Ltd
INCOME TAXES
Reduced tax rate for qualified high technology enterprises (as a percent)	15.00%	15.00%
Number of subsidiaries approved for the reduced tax rate | item			1
Valid period for reduced income tax rate applicable to qualified high technology enterprise	3 years	3 years

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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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 tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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