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Summary of Certain Significant Accounting Policies - Schedule of Revenue Disaggregated (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation Of Revenue [Line Items]
Net sales	$ 1,934	$ 1,456	$ 5,885	$ 4,002
Continuing Operations
Disaggregation Of Revenue [Line Items]
Net sales	1,934	1,456	5,885	4,002
Continuing Operations | International
Disaggregation Of Revenue [Line Items]
Net sales	1,934	1,456	5,885	4,002
Continuing Operations | Oil & Gas
Disaggregation Of Revenue [Line Items]
Net sales	1,377	853	4,191	3,062
Continuing Operations | Oil & Gas | International
Disaggregation Of Revenue [Line Items]
Net sales	1,377	853	4,191	3,062
Continuing Operations | Power Generation & Distribution
Disaggregation Of Revenue [Line Items]
Net sales	132	103	402	333
Continuing Operations | Power Generation & Distribution | International
Disaggregation Of Revenue [Line Items]
Net sales	132	103	402	333
Continuing Operations | Marine & Other Industrial
Disaggregation Of Revenue [Line Items]
Net sales	425	500	1,292	607
Continuing Operations | Marine & Other Industrial | International
Disaggregation Of Revenue [Line Items]
Net sales	$ 425	$ 500	$ 1,292	$ 607

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

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-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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