Leases - Schedule of Components of Lease Expense (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Lease Cost [Abstract]
Operating lease expense		$ 742
Short-term lease expense	[1]	401
Total		1,143	$ 800
Less: Sublease income		(3)
Total lease expense		$ 1,140

[1] Short-term lease expense includes all leases with lease terms ranging from less than one month to one year.