Revenue Recognition - Schedule of Significant Changes in Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Contractors [Abstract]
Contract assets	$ 987	$ 680
Change in Contract Asset	$ 307
Percent Change in Contract Asset	45.10%
Contract liabilities	$ 0	(5)
Change in Contract Liability	$ 5
Percent Change in Contract Liability	100.00%
Net contract assets (liabilities)	$ 987	$ 675
Change in Net Contract Assets (Liabilities)	$ 312
Percent Change in Net Contract Assets (Liabilities)	46.20%