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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands | 12 Months Ended
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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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