Recently Adopted and Recently Issued Accounting Pronouncements - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Operating lease liability	$ 300
Right-of-use asset	$ 287		$ 0
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Operating lease liability		$ 367
Right-of-use asset		$ 367