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Segment Reporting and Geographic Information - Revenues from Major Customers (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Customer A [Member]    
Revenue, Major Customer [Line Items]    
Major Customer balance $ 2,701
Major Customer balance percentage 14.00%
Customer A [Member] | Accounts Receivable [Member]    
Revenue, Major Customer [Line Items]    
Major Customer balance
Major Customer balance percentage
Customer A [Member] | Unbilled Revenues [Member]    
Revenue, Major Customer [Line Items]    
Major Customer balance
Major Customer balance percentage
Customer B [Member]    
Revenue, Major Customer [Line Items]    
Major Customer balance $ 2,735 $ 3,997
Major Customer balance percentage 14.00% 20.00%
Customer B [Member] | Accounts Receivable [Member]    
Revenue, Major Customer [Line Items]    
Major Customer balance $ 1,844 $ 1,135
Major Customer balance percentage 28.00% 23.00%
Customer B [Member] | Unbilled Revenues [Member]    
Revenue, Major Customer [Line Items]    
Major Customer balance $ 1,507 $ 2,788
Major Customer balance percentage 39.00% 35.00%
Customer C [Member]    
Revenue, Major Customer [Line Items]    
Major Customer balance $ 2,889
Major Customer balance percentage 15.00%
Customer C [Member] | Accounts Receivable [Member]    
Revenue, Major Customer [Line Items]    
Major Customer balance $ 1,049
Major Customer balance percentage 16.00%
Customer C [Member] | Unbilled Revenues [Member]    
Revenue, Major Customer [Line Items]    
Major Customer balance $ 1,087
Major Customer balance percentage 28.00%
Customer D [Member]    
Revenue, Major Customer [Line Items]    
Major Customer balance $ 2,200 $ 1,940
Major Customer balance percentage 12.00% 10.00%
Customer D [Member] | Accounts Receivable [Member]    
Revenue, Major Customer [Line Items]    
Major Customer balance $ 834
Major Customer balance percentage 12.00%
Customer D [Member] | Unbilled Revenues [Member]    
Revenue, Major Customer [Line Items]    
Major Customer balance $ 1,402
Major Customer balance percentage 18.00%
Customer E [Member]    
Revenue, Major Customer [Line Items]    
Major Customer balance
Major Customer balance percentage
Customer E [Member] | Accounts Receivable [Member]    
Revenue, Major Customer [Line Items]    
Major Customer balance $ 1,112
Major Customer balance percentage 17.00%
Customer E [Member] | Unbilled Revenues [Member]    
Revenue, Major Customer [Line Items]    
Major Customer balance  
Major Customer balance percentage  
Customer E [Member] | Energy & Security Sonar Solutions [Member]    
Revenue, Major Customer [Line Items]    
Major Customer balance   $ 979
Major Customer balance percentage   12.00%
Customer F [Member]    
Revenue, Major Customer [Line Items]    
Major Customer balance
Major Customer balance percentage
Customer F [Member] | Accounts Receivable [Member]    
Revenue, Major Customer [Line Items]    
Major Customer balance
Major Customer balance percentage
Customer F [Member] | Unbilled Revenues [Member]    
Revenue, Major Customer [Line Items]    
Major Customer balance $ 408  
Major Customer balance percentage 11.00%  
Customer F [Member] | Energy & Security Sonar Solutions [Member]    
Revenue, Major Customer [Line Items]    
Major Customer balance  
Major Customer balance percentage  
Customer G [Member]    
Revenue, Major Customer [Line Items]    
Major Customer balance
Major Customer balance percentage
Customer G [Member] | Accounts Receivable [Member]    
Revenue, Major Customer [Line Items]    
Major Customer balance
Major Customer balance percentage
Customer G [Member] | Unbilled Revenues [Member]    
Revenue, Major Customer [Line Items]    
Major Customer balance  
Major Customer balance percentage  
Customer G [Member] | Energy & Security Sonar Solutions [Member]    
Revenue, Major Customer [Line Items]    
Major Customer balance   $ 1,266
Major Customer balance percentage   16.00%