Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jan. 01, 2019
Leases [Abstract]
Operating lease assets			$ 2,411
Operating lease liabilities	$ 2,312	$ 2,312	$ 2,887
Option to renew, extension of lease term	3 years	3 years
Operating lease payments related to options to extend lease terms		$ 44
Operating lease costs	$ 690	$ 1,069
Cash paid for amounts included in the measurement of operating lease liabilities	$ 688