
For the year ended	2020						2019						2018

U.S. federal income tax (provision) benefit at statutory rate	$	(626)	21.0	%	$	(1,480)	21.0	%	$	(3,677)	25.7	%
Change in unrecognized tax benefits	(33)		1.1	%	(59)		0.8	%	60		(0.4)	%
Change in valuation allowance	(20)		0.7	%	(40)		0.6	%	2,079		(14.5)	%
U.S. tax on foreign operations	(14)		0.5	%	(327)		4.6	%	(20)		0.1	%
Foreign tax rate differential	253		(8.5)	%	993		(14.1)	%	2,606		(18.2)	%
Foreign derived intangible income deduction	67		(2.2)	%	—		—	%	—		—	%
Research and development tax credits	62		(2.1)	%	92		(1.3)	%	67		(0.5)	%
State taxes, net of federal benefit	23		(0.8)	%	102		(1.4)	%	(84)		0.6	%
Repatriation Tax related to the Tax Act	—		—	%	(10)		0.1	%	(1,049)		7.3	%
Remeasurement of deferred tax assets and liabilities related to the Tax Act	—		—	%	—		—	%	(179)		1.3	%
Other	8		(0.3)	%	36		(0.5)	%	29		(0.2)	%
Income tax (provision) benefit	$	(280)	9.4	%	$	(693)	9.8	%	$	(168)	1.2	%

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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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