Inventories - Changes in Inventory Reserve (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Inventory Disclosure [Abstract]
Beginning balance	$ (5,307)	$ (11,782)	$ (5,947)	$ (4,845)
Change in reserve
Inventory reserve charged to costs of sales	(3,472)	(1,298)	(6,541)	(10,745)
Sale of previously reserved inventory	1,578	914	3,231	1,880
Change in reserve	(1,894)	(384)	(3,310)	(8,865)
Write off	835	377	1,976	1,593
Translation adjustments	(139)	461	82	789
Reclassified to assets held for sale	0		694
Ending balance	$ (6,505)	$ (11,328)	$ (6,505)	$ (11,328)