Stock-Based Compensation - Compensation Costs Included in Unaudited Consolidated Statement of Operations for All Stock-based Compensation Arrangements (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	$ 5,093	$ 6,901	$ 2,235	$ 12,618
Related income tax expense (benefit)	587	(1,725)	258	(3,155)
Stock-based compensation expense, net of taxes	5,680	5,176	2,493	9,463
Selling, General and Administrative Expense (Benefit) [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	3,546	5,911	(615)	10,690
Research and Development Expense [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	1,432	752	2,755	1,652
Cost of Sales [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	$ 115	$ 238	$ 95	$ 276