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Summary of Significant Accounting Policies - Additional Information (Detail) |  | 12 Months Ended
--- | --- | ---
Mar. 08, 2012 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) Customer | Dec. 31, 2014 USD ($) Customer
Schedule Of Accounting Policies [Line Items] |  |  |
Bad debt expense |  | $ 172,000 | $ (12,000)
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 |  | 9.00% | 7.00%
Customer one | Credit Concentration Risk | Sales |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Customer accountability percentage |  | 14.00% | 12.00%
Customer one | Credit Concentration Risk | Accounts Receivable |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Customer accountability percentage |  | 3.00% | 4.00%
Acquired Technology | Amnor Technologies |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Cash payment for acquisition | $ 100,000 |  |
Shares payment for acquisition | shares | 44,000 |  |
Common stock, per share | $ / shares | $ 4.95 |  |
Equity Interests Issuable Period | 3 years |  |
Intangible assets acquired | $ 320,000 |  |
Transaction cost | $ 4,000 |  |
Business acquisition equity interests issued during period, percentage of shares | 25.00% |  |
Estimated useful life | 3 years |  |
Unamortized amounts remaining |  | $ 0 |
Acquired Technology | Amnor Technologies | General and Administrative Expense |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Amortization expense related to intangible assets |  | $ 20,000 | $ 110,000
Arc-resistant Technology |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Intangible assets acquired |  |  | $ 220,000
First Anniversary | Acquired Technology | Amnor Technologies |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Business acquisition equity interests issued during period, percentage of shares | 25.00% |  |
Second Anniversary | Acquired Technology | Amnor Technologies |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Business acquisition equity interests issued during period, percentage of shares | 25.00% |  |
Third Anniversary | Acquired Technology | Amnor Technologies |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Business acquisition equity interests issued during period, percentage of shares | 25.00% |  |

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