Shareholders' Equity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Stock-based compensation expense	$ 387,000	$ 204,000
Cost Of Sales [Member]
Stock-based compensation expense	52,000	28,000
Selling Expenses [Member]
Stock-based compensation expense	75,000	52,000
Marketing Expenses [Member]
Stock-based compensation expense	51,000	1,000
General And Administrative Expense [Member]
Stock-based compensation expense	$ 209,000	$ 123,000