Note 17 - Net Loss Per Share Attributable to Common Stockholders (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

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

	Year Ended December 31,
	2021			2020			2019
Net loss	$	(70,470	)	$	(32,220	)	$	(18,645	)
Shares used to compute net loss per share, basic and diluted		121,453,723			88,295,762			21,569,523
Net loss per share attributable to common stockholders, basic and diluted	$	(0.58	)	$	(0.36	)	$	(0.86	)

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

	Year Ended December 31,
	2021		2020		2019
Options to purchase common stock		8,206,137		4,409,806		1,583,575
Warrants to purchase common stock		369,043		14,773,425		17,579,945
Total potentially dilutive securities excluded from denominator of the diluted earnings per share computation		8,575,180		19,183,231		19,163,520