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

6 Months Ended

Jun. 30, 2021

Notes Tables

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

	Three months ended June 30,						Six months ended June 30,
	2021			2020			2021			2020
Numerator:
Net loss	$	(8,203	)	$	(18,600	)	$	(23,825	)	$	(35,397	)
Denominator:
Weighted average shares used to compute net loss per share
Basic		26,850			20,858			26,637			20,533
Diluted		26,850			20,858			26,637			20,533
Net loss per share
Basic	$	(0.31	)	$	(0.89	)	$	(0.89	)	$	(1.72	)
Diluted	$	(0.31	)	$	(0.89	)	$	(0.89	)	$	(1.72	)

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

	Three months ended June 30,				Six months ended June 30,
	2021		2020		2021		2020
Employee stock options		4		11		8		13
Restricted stock units		9		10		14		13
Shares for convertible senior notes		4,587		4,587		4,587		4,587
Total antidilutive shares		4,600		4,608		4,609		4,613