Note 8 - Net Loss Per Share - Schedule of Net Loss 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	$ (6,270)	$ (116,902)	$ (66,857)	$ (175,987)
Weighted-average number of shares outstanding, basic and diluted (in shares)	79,022,467	64,648,650	77,801,774	63,397,196
Net loss per share, basic and diluted (in dollars per share)	$ (0.08)	$ (1.81)	$ (0.86)	$ (2.78)
Anti-dilutive shares excluded from computation of net loss per share (in shares) (in shares)	26,360,485	13,054,457	22,784,728	9,238,156