Note 11 - Net Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Year Ended December 31,
	2022			2021
Numerator
Net loss	$	(26,960	)	$	(20,606	)
Denominator
Weighted average common shares outstanding used to compute net loss per share, basic and diluted		126,624			116,950
Net loss per share of common stock, basic and diluted:	$	(0.21	)	$	(0.18	)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

	Year Ended December 31,
	2022		2021
Options to purchase common stock		12,990		9,036
Series B convertible preferred stock		165		171
Warrants to purchase common stock		21,826		24,144
		34,981		33,351