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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) Customer	Dec. 31, 2016 USD ($) Customer	Dec. 31, 2014 USD ($)
Schedule Of Accounting Policies [Line Items]
Bad debt expense net of (recovery)	$ (127)	$ 214
Non-time and material jobs of short term nature duration description	less than one month
Refinancing of outstanding loans used as working capital	$ 1,000
Estimated liquidity period	12 months
Customer Concentration Risk | Sales
Schedule Of Accounting Policies [Line Items]
Number of Customers | Customer	2	1
Customer accountability percentage	30.00%	19.00%
Credit Concentration Risk | Accounts Receivable
Schedule Of Accounting Policies [Line Items]
Number of Customers | Customer	2	1
Customer accountability percentage	28.00%	17.00%
Geographic Concentration Risk | Sales | Gulf Coast region
Schedule Of Accounting Policies [Line Items]
Customer accountability percentage	8.00%	47.00%
Arc-resistant Technology
Schedule Of Accounting Policies [Line Items]
Intangible assets acquired			$ 220
Arc-resistant Technology | IntelliSafe Products
Schedule Of Accounting Policies [Line Items]
Intangible assets capitalized cost		$ 360
Estimated useful life	5 years
Arc-resistant Technology | IntelliSafe Products | Cost of Sales
Schedule Of Accounting Policies [Line Items]
Amortization expense related to intangible assets	$ 70	$ 50

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