Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based compensation expense        
Stock-based compensation expense $ 708 $ 1,494 $ 3,269 $ 4,233
Research and development        
Share-based compensation expense        
Stock-based compensation expense   66   174
General and administrative        
Share-based compensation expense        
Stock-based compensation expense $ 708 $ 1,428 $ 3,269 $ 4,059