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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based compensation expense        
Stock-based compensation expense $ 773 $ 1,011 $ 2,561 $ 2,739
Research and development        
Share-based compensation expense        
Stock-based compensation expense   59   108
General and administrative        
Share-based compensation expense        
Stock-based compensation expense $ 773 $ 952 $ 2,561 $ 2,631