Stock-Based Compensation - Components of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based Payment Arrangement, Expense	$ 9,438	$ 13,919	$ 8,835
Cost of sales
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based Payment Arrangement, Expense	139	55	73
Selling expenses
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based Payment Arrangement, Expense	1,412	2,711	1,637
General and administrative expenses
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based Payment Arrangement, Expense	7,364	10,394	6,658
Research and development costs
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based Payment Arrangement, Expense	$ 523	$ 759	$ 467