Note 9 - Net Loss Per Share (Tables)

3 Months Ended

Mar. 31, 2021

Notes Tables

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

	Three Months Ended
	March 31,
	2021			2020
Weighted average common shares outstanding:
Basic		118,262			117,353
Dilutive unvested stock, convertible preferred stock, Common Stock Warrants and IPO Warrants		—			—
Diluted		118,262			117,353
Basic and diluted net loss per share attributable to common stockholders	$	(0.06	)	$	(0.02	)

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

	Three Months Ended
	March 31,
	2021		2020
Unvested stock (1)		1,350		1,160
Convertible preferred stock		20,337		15,905
Common Stock Warrants		2,069		1,964
IPO Warrants(2)		12,082		12,082
Total potentially dilutive common shares		35,838		31,111