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INCOME TAXES (Tables)

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Schedule of United States and Foreign Income (Loss) Before Income Taxes and Minority Interest

		Years Ended December 31,
		2019				2018				2017
		(in thousands)
United States		$	6,647			$	13,381			$	(29,673	)
Foreign			(10,591	)			(8,939	)			37,917
		$	(3,944	)		$	4,442			$	8,244

Schedule of Components of the Provision (Benefit) for Income Taxes

		Years Ended December 31,
		2019				2018				2017
		(in thousands)
Current
Federal			(984	)		$	—			$	—
State		—				—				—
Foreign			150			$	(890	)		2,355
Total current income tax expense (benefit)		$	(834	)		$	(890	)		$	2,355
Deferred
Federal		—				—				—
State		—				—				—
Foreign		803				512				(1,092)
Total deferred tax expense (benefit)		803				512				(1,092)
Total income tax expense (benefit)		$	(31	)		$	(378	)		$	1,263

Summary of Unrecognized Tax Benefits

		Years Ended December 31,
		2019				2018				2017
		(in thousands)
Beginning balance-gross unrecognized tax benefits (UTB’s)		$	17,496			$	18,728			$	20,137
Lapse of statute of limitations			(291	)			(1,232	)			(1,409	)
Rate change impact			(1,698	)			—				—
Ending balance—UTB			15,507				17,496				18,728
UTB’s as a credit in deferred taxes			(12,905	)			(14,604	)			(14,604	)
Federal benefit of state taxes			(2,062	)			(2,063	)			(2,063	)
UTB’s that would impact the effective tax rate		$	540			$	829			$	2,061

Summary of the Components of Net Deferred Tax Assets

		December 31,				December 31,
		2019				2018
		(in thousands)
Deferred Tax Assets
Allowance and reserves		$	2,935			$	(10,671	)
Prepaid expense			95				28
Net operating loss carryforward			162,712				164,512
Tax credit carryforwards			5,660				32,958
Writedown/amortization of intangible assets and goodwill			15				241
Property, plant and equipment			4,147				3,500
Demo equipment income			4,588				4,439
Accrued warranties			25				(302	)
Other			15,193				14,205
Total deferred tax assets			195,370				208,910
Deferred Tax Liabilities
Deferred revenue and customer advances, net			(157	)			27
Total deferred tax liabilities		(157)				27
Total net deferred tax assets			195,213				208,937
Less: Valuation Allowance			(193,788	)			(206,630	)
Total net deferred tax assets		$                           1,425				$                              2,307

Schedule of Reconciliation of Effective Income Tax Amount and the Federal Statutory Amount

		Years Ended December 31,
		2019				2018				2017
		(in thousands)
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 tax expense (benefit)		$	(31	)		$	(378	)		$	1,263

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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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