Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Income Tax [Line Items]
Income tax expense	$ 122	$ 178	$ 182	$ 299
Ireland
Income Tax [Line Items]
Net operating loss carryforwards	$ 31,807		$ 31,807		$ 30,261

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