Significant Stock-Based Plan Activity and Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Stock-Based Compensation Expense [Abstract]
Total Stock-based compensation expense	$ 418	$ 485
Unrecognized stock-based compensation expense	$ 2,600
Weighted average remaining vesting period	2 years 160 days
Cost of sales
Stock-Based Compensation Expense [Abstract]
Total Stock-based compensation expense	$ 48	52
Selling, general and administrative expense
Stock-Based Compensation Expense [Abstract]
Total Stock-based compensation expense	$ 370	$ 433