Note 10 - Net Loss Per Share (Tables)

3 Months Ended

Mar. 31, 2020

Notes Tables

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

	Three Months Ended
	March 31,
	2020			2019
Weighted average common shares outstanding:
Basic		117,353			106,940
Dilutive unvested stock, convertible preferred stock, Common Stock Warrants and IPO Warrants		—			—
Diluted		117,353			106,940
Basic and diluted net loss per share attributable to common stockholders	$	(0.02	)	$	(0.16	)

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

	Three Months Ended
	March 31,
	2020		2019
Unvested stock (1)		1,160		490
Convertible preferred stock		15,905		11,127
Common Stock Warrants		1,964		1,376
IPO Warrants (2)		12,082		12,082
Total potentially dilutive common shares		31,111		25,075