Revenue Recognition - Schedule of Significant Changes in Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Contractors [Abstract]
Contract assets	$ 1,199	$ 987
Change in Contract Asset	$ 212
Percent Change in Contract Asset	21.50%
Contract liabilities	$ (5)	0
Change in Contract Liability	$ (5)
Percent Change in Contract Liability	0.00%
Net contract assets (liabilities)	$ 1,194	$ 987
Change in Net Contract Assets (Liabilities)	$ 207
Percent Change in Net Contract Assets (Liabilities)	21.00%