Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Stock-Based Compensation (Details)

v3.20.4
Stockholders' Equity - Stock-Based Compensation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation expense $ 2,780 $ 3,121
Research and development [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation expense 617 707
General and administrative [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation expense $ 2,163 $ 2,414