Leases - Summary of Amounts Included in the Condensed Consolidated Statement of Financial Position (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Assets And Liabilities Lessee [Abstract]
Right of use asset - operating leases	$ 6,384	$ 0
Operating lease liability - short-term	2,215	0
Operating lease liability - long-term	4,402	$ 0
Total operating lease liabilities	$ 6,617