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

3 Months Ended

Mar. 31, 2022

Notes Tables

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

	Three months ended March 31,
	2022			2021
Numerator:
Net loss	$	(16,062	)	$	(15,622	)
Denominator:
Weighted average shares used to compute net loss per share
Basic	27,463			26,438
Diluted	27,463			26,438
Net loss per share
Basic	$ (0.58)			$ (0.59)
Diluted	$ (0.58)			$ (0.59)

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

	Three months ended March 31,
	2022		2021
Employee stock options		—		13
Restricted stock units		—		20
Shares for convertible senior notes		4,587		4,587
Total antidilutive shares		4,587		4,620