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Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2024

Notes Tables

Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]

Exercise price per warrant		$	33.00
Conversion rate - common shares per warrant			1.50
Closing price of common stock		$	23.72
Volatility			75	%
Risk-free interest rate			5.40	%
Expected life of option (in years)			0.3
Dividend yield		zero

Schedule of Segment Reporting Information, by Segment [Table Text Block]

		Years Ended December 31,
		2024				2023				2022
Operating expenses
Research and development		$	69,637			$	89,423			$	68,032
General and administrative			71,809				16,534				11,988
Other segment items(a)			(117,104	)			(8,740	)			(3,774	)
Net loss		$	24,342			$	97,217			$	76,246

		December 31,
		2024				2023
Cash and cash equivalents		$	128,574			$	121,136

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

		Years ended December 31,
		2024				2023				2022
Numerator, basic:
Net loss		$	(24,342	)		$	(97,217	)		$	(76,246	)
Denominator, basic:
Weighted average common shares outstanding			46,329				41,932				40,202
Net loss per share, basic			(0.53	)			(2.32	)			(1.90	)
Numerator, diluted:
Net loss		$	(24,342	)		$	(97,217	)		$	(76,246	)
Adjustment for change in fair value of warrant liabilities			(43,793	)			—				—
Adjusted numerator, diluted		$	(68,135	)		$	(97,217	)		$	(76,246	)
Denominator, diluted:
Weighted average common shares outstanding			46,329				41,932				40,202
Dilutive effect of common stock warrants			275				—				—
Weighted average dilutive common shares			46,604				41,932				40,202
Net loss per share, diluted		$	(1.46	)		$	(2.32	)		$	(1.90	)
Dilutive common stock options excluded from net loss per share, diluted			3,154				2,123				2,055
Dilutive Performance Awards excluded from loss per share, diluted			7				7				7

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Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis.

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