Note 11 - Net Loss Per Share - Calculation of Basic and Diluted Net (Loss) Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Net loss	$ (17,400)	$ (29,309)	$ (65,090)	$ (83,840)
Shares used to compute net loss per share - basic and diluted (in shares)	152,026,112	126,889,718	145,810,175	126,374,424
Net loss per share - basic and diluted (in dollars per share)	$ (0.11)	$ (0.23)	$ (0.45)	$ (0.66)