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Revenue Recognition - Schedule of Significant Changes in Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Contractors [Abstract]    
Contract assets $ 1,080 $ 680
Change in Contract Asset $ 400  
Percent Change in Contract Asset 58.80%  
Contract liabilities $ (1) (5)
Change in Contract Liability $ 4  
Percent Change in Contract Liability 80.00%  
Net contract assets (liabilities) $ 1,079 $ 675
Change in Net Contract Assets (Liabilities) $ 404  
Percent Change in Net Contract Assets (Liabilities) 59.90%