Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Stock-Based Compensation (Details)

v3.20.2
Stockholders' Equity - Stock-Based Compensation (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 [Line Items]        
Total stock-based compensation expense $ 731 $ 813 $ 1,370 $ 1,611
Research and development [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense 161 184 305 380
General and administrative [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense $ 570 $ 629 $ 1,065 $ 1,231