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Segment, Customer and Geographic Information - Revenue by Geographical Location (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, Major Customer [Line Items]
Revenue									$ 76,051	$ 51,326	$ 39,275
Product
Revenue, Major Customer [Line Items]
Revenue	$ 16,525	$ 15,399	$ 15,420	$ 13,564	$ 16,240	$ 10,797	$ 9,525	$ 7,006	60,908	43,568	37,183
Product | FRANCE
Revenue, Major Customer [Line Items]
Revenue									23,043	9,692	3,485
Product | UNITED STATES
Revenue, Major Customer [Line Items]
Revenue									12,563	6,316	4,480
Product | BELGIUM
Revenue, Major Customer [Line Items]
Revenue									6,788	6,263	6,392
Product | KUWAIT
Revenue, Major Customer [Line Items]
Revenue									883	2,788	4,415
Product | Other Countries
Revenue, Major Customer [Line Items]
Revenue									17,631	18,509	18,411
Government Contract
Revenue, Major Customer [Line Items]
Revenue	$ 3,713	$ 3,928	$ 4,047	$ 3,455	$ 2,378	$ 2,285	$ 1,667	$ 1,428	15,143	7,758	2,092
Government Contract | UNITED STATES
Revenue, Major Customer [Line Items]
Revenue									$ 15,143	$ 7,758	$ 2,092

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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