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Segment Reporting and Geographic Information - Revenues, Accounts Receivable and Unbilled Revenue from Major Customers (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Customer A [Member]    
Revenue, Major Customer [Line Items]    
Major Customer balance $ 1,828
Major Customer balance percentage 0.00% 21.00%
Customer A [Member] | Accounts Receivable [Member]    
Revenue, Major Customer [Line Items]    
Major Customer balance [1],[2]
Major Customer balance percentage [1],[2] 0.00% 0.00%
Customer B [Member]    
Revenue, Major Customer [Line Items]    
Major Customer balance $ 1,295
Major Customer balance percentage 0.00% 15.00%
Customer B [Member] | Accounts Receivable [Member]    
Revenue, Major Customer [Line Items]    
Major Customer balance [1],[2]
Major Customer balance percentage [1],[2] 0.00% 0.00%
Customer C [Member]    
Revenue, Major Customer [Line Items]    
Major Customer balance [1]
Major Customer balance percentage [1] 0.00% 0.00%
Customer C [Member] | Accounts Receivable [Member]    
Revenue, Major Customer [Line Items]    
Major Customer balance [2] $ 297 $ 283
Major Customer balance percentage [2] 27.00% 28.00%
[1] Balance is not significant
[2] Following the closing of the 2016 DSIT Transaction (see Note 3), the Company no longer consolidates the assets, liabilities or results of DSIT, but rather reports its investment in DSIT using the equity method. Accordingly, the Company no longer reports DSIT’s Accounts Receivable or Unbilled Revenue balances.