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Segment Information and Major Customers - Sales Information by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue from External Customer [Line Items]
Revenue	$ 130,129	$ 133,143	$ 128,715	$ 114,523	$ 115,787	$ 114,092	$ 156,391	$ 143,791	$ 506,510	$ 530,061	$ 529,277
United States [Member]
Revenue from External Customer [Line Items]
Revenue									352,079	300,853	288,843
Germany [Member]
Revenue from External Customer [Line Items]
Revenue									74,882	78,062	167,251
Mexico [Member]
Revenue from External Customer [Line Items]
Revenue									4,087	90,795	12,186
Other International [Member]
Revenue from External Customer [Line Items]
Revenue									$ 75,462	$ 60,351	$ 60,997

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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