Significant Stock-Based Plan Activity and Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Stock-Based Compensation Expense [Abstract]
Total Stock-based compensation expense	$ 485	$ 357
Unrecognized stock-based compensation expense	$ 2,600
Weighted average remaining vesting period	2 years 3 months
Selling, general and administrative expense
Stock-Based Compensation Expense [Abstract]
Total Stock-based compensation expense	$ 433	338
Cost of sales
Stock-Based Compensation Expense [Abstract]
Total Stock-based compensation expense	$ 52	$ 19