Revenues - Schedule of Contract Asset and Liability Balances (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Contract With Customer, Liability, Revenue Recognized, Billed Prior Period		$ 37	$ 600	$ 2,600
Contract assets	$ 5,479		5,479		$ 1,818
Contract liabilities	(810)		(810)		$ (1,821)
Contract With Customer, Asset, Revenue Recognized	$ 200		$ 3,700