Quarterly report pursuant to Section 13 or 15(d)

Stock Plans - Stock-based compensation expense (Details)

v3.21.1
Stock Plans - Stock-based compensation expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost    
Total stock-based compensation expense $ 248 $ (84)
Research and development    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost    
Total stock-based compensation expense 120 0
Selling, general and administrative    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost    
Total stock-based compensation expense $ 128 $ (84)