Leases - Summary of Amounts Included in the Condensed Consolidated Statement of Financial Position (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets And Liabilities Lessee [Abstract]
Right of use asset - operating leases	$ 5,529	$ 0
Operating lease liability - short-term	1,895	0
Operating lease liability - long-term	3,878	$ 0
Total operating lease liabilities	$ 5,773