Note 6 - Earnings (Loss) Per Share (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

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

	Three months ended September 30,						Nine months ended September 30,
	2020			2019			2020			2019
Numerator:
Net loss	$	(9,616	)	$	(8,780	)	$	(45,013	)	$	(30,620	)
Denominator:
Weighted average shares used to compute net loss per share
Basic		22,744			20,023			21,276			19,940
Diluted		22,744			20,023			21,276			19,940
Net loss per share
Basic	$	(0.42	)	$	(0.44	)	$	(2.12	)	$	(1.54	)
Diluted	$	(0.42	)	$	(0.44	)	$	(2.12	)	$	(1.54	)

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

	Three months ended September 30,				Nine months ended September 30,
	2020		2019		2020		2019
Employee stock options		51		16		27		50
Restricted stock units		113		19		9		-
Shares for convertible senior notes		4,587		4,587		4,587		4,587
Total antidilutive shares		4,751		4,622		4,623		4,637