Note 13 - Net Loss Per Share (Tables)

6 Months Ended

Jun. 30, 2020

Notes Tables

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

	Three Months Ended June 30,						Three Months Ended June 30,
	2020			2019			2020			2019
Net loss	$	(8,977	)	$	(5,637	)	$	(10,274	)	$	(6,976	)
Shares used to compute net loss per share – basic and diluted		74,675,131			14,597,446			67,676,138			10,969,473
Net loss per share – basic and diluted	$	(0.12	)	$	(0.39	)	$	(0.15	)	$	(0.64	)

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

	Three Months Ended June 30,		Six Months Ended June 30,
	2020	2019	2020	2019
Options to purchase common stock	2,654,144	1,561,067	2,216,462	1,212,654
PRSUs	411,000	—	223,566	—
Warrants to purchase common stock	23,522,891	11,802,695	28,729,806	5,944,948
Total potentially dilutive securities excluded from denominator of the diluted earnings per share computation	26,588,035	13,363,762	31,169,834	7,157,602