Annual report pursuant to Section 13 and 15(d)

Stock and Employee Benefit Plans - Stock Based Compensation Expense (Details)

v3.20.1
Stock and Employee Benefit Plans - Stock Based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation $ 5,374 $ 4,943
Research and development    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation 2,446 1,984
General and administrative    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation $ 2,928 $ 2,959