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Summary of Significant Accounting Policies - Additional Information (Detail) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Mar. 08, 2012 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) Customer | Dec. 31, 2015 USD ($) Customer | Dec. 31, 2014 USD ($)
Schedule Of Accounting Policies [Line Items] |  |  |  |
Bad debt expense |  | $ 214 | $ 172 |
Non-time and material jobs of short term nature duration description |  | less than one month |  |
Number of Customers | Customer |  | 1 | 1 |
Geographic Concentration Risk | Sales | Gulf Coast region |  |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |  |
Customer accountability percentage |  | 47.00% | 68.00% |
Customer one | Credit Concentration Risk | Sales |  |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |  |
Customer accountability percentage |  | 19.00% | 14.00% |
Customer one | Credit Concentration Risk | Accounts Receivable |  |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |  |
Customer accountability percentage |  | 17.00% | 3.00% |
Acquired Technology | Amnor Technologies |  |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |  |
Cash payment for acquisition | $ 100 |  |  |
Shares payment for acquisition | shares | 44,000 |  |  |
Common stock, per share | $ / shares | $ 4.95 |  |  |
Equity Interests Issuable Period | 3 years |  |  |
Intangible assets acquired | $ 320 |  |  |
Transaction cost | $ 4 |  |  |
Business acquisition equity interests issued during period, percentage of shares | 25.00% |  |  |
Estimated useful life | 3 years |  |  |
Estimated useful life expiration year | 2015 |  |  |
Acquired Technology | Amnor Technologies | General and Administrative Expense |  |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |  |
Amortization expense related to intangible assets |  |  | $ 20 |
Acquired Technology | First Anniversary | Amnor Technologies |  |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |  |
Business acquisition equity interests issued during period, percentage of shares | 25.00% |  |  |
Acquired Technology | Second Anniversary | Amnor Technologies |  |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |  |
Business acquisition equity interests issued during period, percentage of shares | 25.00% |  |  |
Acquired Technology | Third Anniversary | Amnor Technologies |  |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |  |
Business acquisition equity interests issued during period, percentage of shares | 25.00% |  |  |
Arc-resistant Technology |  |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |  |
Intangible assets acquired |  |  |  | $ 220
Arc-resistant Technology | IntelliSafe Products |  |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |  |
Estimated useful life |  | 5 years |  |
Intangible assets capitalized cost |  | $ 360 |  |
Arc-resistant Technology | Cost of Sales | IntelliSafe Products |  |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |  |
Amortization expense related to intangible assets |  | $ 50 |  |

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