Annual report pursuant to Section 13 and 15(d)

Stock-based Compensation - Stock-Based Compensation Expense (Details)

v3.20.4
Stock-based Compensation - Stock-Based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of stock-based compensation expense      
Stock-based compensation $ 7,728 $ 6,943 $ 7,889
Stock options      
Schedule of stock-based compensation expense      
Stock-based compensation 2,381 2,149 1,975
RSUs and RSAs      
Schedule of stock-based compensation expense      
Stock-based compensation 2,231 1,805 1,770
PSUs      
Schedule of stock-based compensation expense      
Stock-based compensation 1,160 1,087 1,511
PBOs      
Schedule of stock-based compensation expense      
Stock-based compensation 1,956 1,902 2,633
Research and development      
Schedule of stock-based compensation expense      
Stock-based compensation 1,620 1,562 2,055
Selling, general and administrative      
Schedule of stock-based compensation expense      
Stock-based compensation $ 6,108 $ 5,381 $ 5,834