Reduction in Workforce (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Restructuring and Related Activities [Abstract]
Expected cost		$ 100
Severance costs paid	$ 100
Restructuring Reserve
Balance as of January 1, 2018	111
Payments	(111)
Balance as of September 30, 2018	$ 0