Quarterly report pursuant to Section 13 or 15(d)

Note 10 - Stock-based Compensation - Share-based Payment Expense (Details)

v3.19.2
Note 10 - Stock-based Compensation - Share-based Payment Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based payment expense $ 568 $ 515 $ 1,230 $ 2,743
Research and Development Expense [Member]        
Share-based payment expense 157 152 275 518
General and Administrative Expense [Member]        
Share-based payment expense $ 411 $ 363 $ 955 $ 2,225