Lease (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Operating lease asset	$ 3,714
Operating lease, liability	$ 3,729
ASU 2016-02
Lessee, Lease, Description [Line Items]
Operating lease asset		$ 3,800
Operating lease, liability		$ 3,800