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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Share-based payment expense $ 779 $ 2,164 $ 3,293 $ 8,807
Research and Development Expense [Member]        
Share-based payment expense 537 998 1,483 2,376
General and Administrative Expense [Member]        
Share-based payment expense $ 242 $ 1,166 $ 1,810 $ 6,431