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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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue from External Customer [Line Items]
Sales	$ 140,088	$ 140,335	$ 128,048	$ 120,806	$ 126,836	$ 185,112	$ 184,673	$ 170,279	$ 529,277	$ 666,900	$ 636,781
United States [Member]
Revenue from External Customer [Line Items]
Sales									288,843	508,178	501,337
Germany [Member]
Revenue from External Customer [Line Items]
Sales									167,251	119,502	85,780
Other International [Member]
Revenue from External Customer [Line Items]
Sales									$ 73,183	$ 39,220	$ 49,664

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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 606
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