Summary of Significant Accounting Policies (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Beginning balance	$ 7	$ 31
Charges to costs and expenses		(20)
Account write-offs, less recoveries		(4)
Ending balance	$ 7	$ 7