Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Stock-based Compensation - Share-based Payment Expense (Details)

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Note 11 - Stock-based Compensation - Share-based Payment Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Share-based payment expense $ 1,053 $ 1,828 $ 4,346 $ 10,635
Research and Development Expense [Member]        
Share-based payment expense 440 609 1,923 2,985
General and Administrative Expense [Member]        
Share-based payment expense $ 613 $ 1,219 $ 2,423 $ 7,650