Note 10 - Equity Incentive Plans (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

Share-Based Payment Arrangement, Option, Activity [Table Text Block]

							Weighted					Weighted
	Shares			Number of			Option Average		Unvested			RSU Average
	Available			Options			Exercise		RSU Shares			Grant Date
	For Grant			Outstanding			Price		Outstanding			Fair Value
Balance as of January 1, 2026		10,875,110			25,407,299		$	1.96		5,733,306		$	0.70
Granted		(7,990,020	)		5,280,640		$	0.68		2,709,380		$	0.68
Exercised		—			—		$	—		—		$	—
Released		—			—		$	—		(1,426,449	)	$	0.77
Forfeited		743,521			(418,889	)	$	0.88		(324,632	)	$	0.93
Canceled		2,491,495			(2,501,431	)	$	3.19		—		$	—
Balance as of March 31, 2026		6,120,106			27,767,619		$	1.62		6,691,605		$	0.67

Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Three Months Ended March 31,
	2026			2025
Risk-free interest rate		3.9	%		4.1% - 4.4%
Expected term (in years)		6.0			6.0
Expected volatility		118.4	%		126.5	%
Dividend yield		—	%		—	%

Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

	Three Months Ended March 31,
	2026		2025
Research and development	$	812	$	1,702
General and administrative		670		757
Total stock-based compensation	$	1,482	$	2,459