Note 10 - Net Loss Per Share (Tables)

6 Months Ended

Jun. 30, 2022

Notes Tables

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

	Three Months Ended June 30,						Six Months Ended June 30,
	2022			2021			2022			2021
Numerator
Net loss attributable to common shareholders	$	(6,672	)	$	(7,039	)	$	(11,457	)	$	(10,577	)
Denominator
Weighted average common shares outstanding used to compute net loss per share, basic and diluted		126,624			121,572			126,624			107,160
Net loss per share of common stock, basic and diluted	$	(0.05	)	$	(0.06	)	$	(0.09	)	$	(0.10	)

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Options to purchase common stock		13,337		8,905		12,219		7,991
Series B convertible preferred stock		165		175		165		176
Warrants to purchase common stock		22,009		26,919		22,142		26,003
		35,511		35,999		34,526		34,170