Quarterly report pursuant to Section 13 or 15(d)

Stock Plans - Stock-based compensation expense (Details)

v3.20.2
Stock Plans - 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 Arrangement by Share-based Payment Award, Compensation Cost        
Total stock-based compensation expense $ 79 $ 350 $ (5) $ 486
Research and development        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost        
Total stock-based compensation expense 0 14 0 91
Selling, general and administrative        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost        
Total stock-based compensation expense $ 79 $ 336 $ (5) $ 395