Defined Contribution Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Defined Contribution Plan
Contributions to the 401(k) Plan	$ 148	$ 137
Layering first
Defined Contribution Plan
Eligible Employees to contribute (as a percent)	3.00%
Company's match (as a percent)	100.00%
Layering second
Defined Contribution Plan
Eligible Employees to contribute (as a percent)	2.00%
Company's match (as a percent)	50.00%