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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Income Tax [Line Items]
Income tax expense	$ 178	$ 157	$ 299	$ 291
Ireland
Income Tax [Line Items]
Net operating loss carryforwards	$ 29,318		$ 29,318		$ 26,195

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- Definition

Income tax.

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- Definition

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

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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