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Provision for Income Taxes by Jurisdiction (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
Federal	$ (393)	$ (24,012)	$ (3,809)
State	718	(438)	(207)
Foreign	4,494	3,345	4,027
Total	$ 4,819	$ (21,105)	$ 11

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