Note 9 - Net Loss Per Share (Tables)

3 Months Ended

Mar. 31, 2022

Notes Tables

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

	Three Months Ended
	March 31,
	2022			2021
Weighted average common shares outstanding:
Basic		121,328			118,262
Dilutive unvested stock, convertible preferred stock, Common Stock Warrants and IPO Warrants		—			—
Diluted		121,328			118,262
Basic and diluted net loss per share attributable to common stockholders	$	(0.14	)	$	(0.06	)

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

	Three Months Ended
	March 31,
	2022		2021
Unvested stock(1)		1,347		1,350
Convertible preferred stock		37,671		20,337
Common Stock Warrants		1,452		2,069
IPO Warrants(2)		12,082		12,082
Total potentially dilutive common shares		52,552		35,838