Basis of Financial Statement Presentation (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jan. 01, 2019
Basis of Financial Statement Presentation
Election of practical expedients package	true
Election of Use of Hindsight practical expedient	true
Operating lease liability	$ 996
ASU 2016-02 | Adjustment
Basis of Financial Statement Presentation
Operating lease, ROU asset		$ 1,200
Operating lease, ROU asset, Statement of Financial Position		us-gaap:PropertyPlantAndEquipmentNet
Operating lease liability		$ 1,200
Operating lease, liability, Statement of Financial Position		us-gaap:AccruedLiabilitiesAndOtherLiabilities