Note 9 - Net Loss Per Share (Tables)

9 Months Ended

Sep. 30, 2019

Notes Tables

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

	Three months ended						Nine months ended
	September 30,						September 30,
	2019			2018			2019			2018
Weighted average common shares outstanding:
Basic		107,181			106,639			107,062			106,476
Dilutive unvested stock, Convertible Preferred Stock, Common Stock Warrants and IPO Warrants		—			—			—			—
Diluted		107,181			106,639			107,062			106,476
Basic and diluted net loss per share attributable to common stockholders	$	(0.06	)	$	(0.10	)	$	(0.29	)	$	(0.29	)

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

	Three months ended				Nine months ended
	September 30,				September 30,
	2019		2018		2019		2018
Unvested stock (1)		989		513		768		483
Convertible Preferred Stock		14,678		3,322		12,829		1,119
Common Stock Warrants		1,801		425		1,576		143
IPO Warrants (2)		12,082		12,082		12,082		12,082
Total potentially dilutive common shares		29,550		16,342		27,255		13,827