Note 10 - Net Loss Per Share - Basic and Diluted Common Shares (Details) - $ / shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Weighted average shares outstanding - basic and diluted (in shares)	129,418	119,374	125,716	118,677
Dilutive unvested stock, convertible preferred stock, Common Stock Warrants and IPO Warrants (in shares)	0	0	0	0
Diluted (in shares)	129,418	119,374	125,716	118,677
Net loss per common share - basic and diluted (in dollars per share)	$ (0.19)	$ (0.03)	$ (0.47)	$ (0.23)