Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Summary of Stock-based Compensation Expense Recognized (Details)

v3.20.4
Stockholders' Equity - Summary of Stock-based Compensation Expense Recognized (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Stock-based compensation expense by type of award:      
Stock-based compensation expense $ 8,203 $ 9,129 $ 12,790
Stock Option Plan Awards      
Stock-based compensation expense by type of award:      
Stock-based compensation expense 709 2,977 6,015
Restricted stock units and restricted stock awards      
Stock-based compensation expense by type of award:      
Stock-based compensation expense 6,717 5,413 5,890
Employee Stock Purchase Plan      
Stock-based compensation expense by type of award:      
Stock-based compensation expense $ 777 $ 739 $ 885