Summary of Significant Accounting Policies (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Beginning balance	$ 31	$ 389
Charges to costs and expenses	(20)	(235)
Accounts write offs, less recoveries	(4)	(123)
Ending balance	$ 7	$ 31