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INCOME TAXES (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Schedule of United States and foreign income (loss) before income taxes and minority interest

		Years Ended December 31,
		2018				2017				2016
		(in thousands)
United States		$	13,381			$	(29,673	)		$	7,905
Foreign			(8,939	)			37,917				(6,985	)
		$	4,442			$	8,244			$	920

Schedule of components of the provision (benefit) for income taxes

		Years Ended December 31,
		2018				2017				2016
		(in thousands)
Current
Federal		$	—			$	—			$	—
State		—				—				—
Foreign		$	(890	)		$	2,355			17
Total Current		$	(890	)		$	2,355			$	17
Deferred
Federal		—				—				—
State		—				—				—
Foreign		512				(1,092)				771
Total Deferred		512				(1,092)				771
Total		$	(378	)		$	1,263			$	788

Summary of unrecognized tax benefits

		Years Ended December 31,
		2018				2017				2016
		(in thousands)
Beginning balance-gross unrecognized tax benefits (UTB’s)		$	18,728			$	20,137			$	22,694
Lapse of statute of limitations			(1,232	)			(1,409	)			(2,557	)
Ending balance—UTB			17,496				18,728				20,137
UTB’s as a credit in deferred taxes			(14,604	)			(14,604	)			(14,604	)
Federal benefit of state taxes			(2,063	)			(2,063	)			(2,063	)
UTB’s that would impact the effective tax rate		$	829			$	2,061			$	3,470

Summary of the components of net deferred tax assets

		December 31,				December 31,
		2018				2017
		(in thousands)
Deferred Tax Assets
Deferred revenue and customer advances, net		$	27			$	663
Prepaid expense			28			—
Net operating loss carryforward			164,512				165,408
Tax credit carryforwards			32,958				60,807
Writedown/amortization of intangible assets and goodwill			241				1,421
Fixed assets			3,500				3,448
Demo equipment income			4,439				4,415
Other			14,205				13,230
Total Deferred Tax Assets			219,910				249,392
Deferred Tax Liabilities
Prepaid expense		—				(29)
Allowance and reserves			(10,671	)		(9,689)
Accrued warranties		(302)				(330)
Total Deferred Tax Liabilities		(10,973)				(10,048)
Total Net Deferred Tax Assets		$	208,937			$	239,344
Less: Valuation Allowance		$	(206,630	)		$	(236,332	)
Total Net Deferred Tax Assets		2,307				3,012

Schedule of reconciliation of effective income tax amount and the federal statutory amount

		Years Ended December 31,
		2018				2017				2016
		(in thousands)
Federal tax (benefit) at statutory rate		$	1,120			$	2,885			$	322
Stock compensation expense			184				295				463
Effect of differences in foreign tax rates			2,113				(6,793	)			4,475
Summary of Interpretation No. 48 (“Fin 48”) Reserve			(1,230	)			(1,478	)			(2,465	)
Change in deferred tax valuation allowance			(1,679	)			5,971				(3,015	)
Other			(886	)			383				1,008
Total Tax Expense		$	(378	)		$	1,263			$	788

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Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.

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Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

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Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

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Tabular disclosure of income before income tax between domestic and foreign jurisdictions.

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Tabular disclosure of the change in unrecognized tax benefits.

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