Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.1
Note 10 - Stock-based Compensation - Share-based Payment Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based payment expense $ 662 $ 2,228
Research and Development Expense [Member]    
Share-based payment expense 118 367
General and Administrative Expense [Member]    
Share-based payment expense $ 544 $ 1,861