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Revenue Recognition (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Contract assets:        
Unbilled receivables, Balance at Beginning of Period $ 1,542 $ 1,883 $ 1,429 $ 2,259
Unbilled receivables, Revenue Recognized In Advance of Billings 1,170 43 1,745 169
Unbilled receivables, Billings (557) (283) (1,019) (785)
Unbilled receivables, Balance at End of Period $ 2,155 $ 1,643 $ 2,155 $ 1,643