Significant Stock-Based Plan Activity and Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Stock-Based Compensation Expense [Abstract]
Total Stock-based compensation expense	$ 202	$ 197	$ 687	$ 554
Unrecognized stock-based compensation expense	2,400		$ 2,400
Weighted average remaining vesting period			2 years
Selling, general and administrative expense
Stock-Based Compensation Expense [Abstract]
Total Stock-based compensation expense	188	180	$ 621	518
Cost of sales
Stock-Based Compensation Expense [Abstract]
Total Stock-based compensation expense	$ 14	$ 17	$ 66	$ 36