Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Schedule of stock-based compensation expense) (Details)

v3.20.2
Stockholders' Equity (Schedule of 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 $ 957 $ 622 $ 1,762 $ 1,054
General and Administrative [Member]        
Share-based Compensation 513 333 865 669
Research and Development [Member]        
Share-based Compensation $ 444 $ 289 $ 897 $ 385