Leases - Lease Obligations (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019
Leases [Abstract]
Right of use asset - operating lease	$ 4,421	$ 4,452
Lease liability, current - operating lease	186	111
Lease liability, noncurrent	5,057	$ 5,156
Total lease liability	$ 5,243