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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%