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Note 11 - Net Loss Per Share Attributable to Common Stockholders (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

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

		*Year Ended*
		*December 31,*
		*2020*				*2019*
Weighted average common shares outstanding:
Basic			117,524				109,057
Dilutive unvested stock, convertible preferred stock, Common Stock Warrants and IPO Warrants			—				—
Diluted			117,524				109,057

Basic and diluted net loss per share attributable to common stockholders		$	(0.24	)		$	(0.45	)

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

		*Year Ended*
		*December 31,*
		*2020*				*2019*
Unvested stock ⁽¹⁾			916				861
Convertible preferred stock			16,635				13,697
Common Stock Warrants			1,976				1,662
IPO Warrants⁽²⁾			12,082				12,082
Total potentially dilutive common shares			31,609				28,302