Note 9 - Net Loss Per Share of Common Stock (Tables)

6 Months Ended

Jun. 30, 2022

Notes Tables

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

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2022			2021			2022			2021
Net loss	$	(18,477	)	$	(7,105	)	$	(31,534	)	$	(15,109	)
Basic and diluted net loss per share	$	(0.61	)	$	(0.35	)	$	(1.22	)	$	(0.78	)
Weighted-average shares used to compute basic and diluted net loss per share		30,505			20,414			25,844			19,247

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

	Six Months Ended
	June 30,
	2022		2021
Options to purchase common stock		3,945,453		2,298,237
Common stock warrants		4,850,241		—