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

9 Months Ended

Sep. 30, 2021

Notes Tables

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

	Three months ended September 30,						Nine months ended September 30,
	2021			2020			2021			2020
Numerator:
Net loss	$	(15,797	)	$	(9,616	)	$	(39,622	)	$	(45,013	)
Denominator:
Weighted average shares used to compute net loss per share
Basic		27,097			22,744			26,791			21,276
Diluted		27,097			22,744			26,791			21,276
Net loss per share
Basic	$	(0.58	)	$	(0.42	)	$	(1.48	)	$	(2.12	)
Diluted	$	(0.58	)	$	(0.42	)	$	(1.48	)	$	(2.12	)

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

	Three months ended September 30,				Nine months ended September 30,
	2021		2020		2021		2020
Employee stock options		1		51		3		27
Restricted stock units		2		113		6		9
Shares for convertible senior notes		4,587		4,587		4,587		4,587
Total antidilutive shares		4,590		4,751		4,596		4,623