Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Compensation expense (Details)

v3.20.4
Stock-Based Compensation - Compensation expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Stock Based Compensation      
Stock-based compensation $ 9,134 $ 10,511 $ 5,707
Operating expense      
Stock Based Compensation      
Stock-based compensation (80) 113 108
Selling, general and administrative      
Stock Based Compensation      
Stock-based compensation $ 9,214 $ 10,398 $ 5,599