Note 5 - Balance Sheet Components (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Cash, Cash Equivalents and Investments [Table Text Block]

	Amortized		Gross Unrealized					Estimated		Cash and Cash		Short-Term
	Cost		Gains		Losses			Fair Value		Equivalents		Investments
December 31, 2023
Cash at banks	$	3,352	$	—	$	—		$	3,352	$	3,352	$	—
Money market funds		31,403		—		—			31,403		31,403		—
U.S. Treasury securities		4,959		—		(1	)		4,958		—		4,958
Total	$	39,714	$	—	$	(1	)	$	39,713	$	34,755	$	4,958

	Amortized		Gross Unrealized					Estimated		Cash, Cash Equivalents		Short-Term
	Cost		Gains		Losses			Fair Value		and Restricted Cash		Investments
December 31, 2022
Cash at banks	$	15,179	$	—	$	—		$	15,179	$	15,179	$	—
Money market funds		30,834		—		—			30,834		30,834		—
U.S. Treasury securities		41,812		—		(270	)		41,542		—		41,542
Corporate securities		8,191		—		(29	)		8,162		—		8,162
Total	$	96,016	$	—	$	(299	)	$	95,717	$	46,013	$	49,704

Property, Plant and Equipment [Table Text Block]

	December 31, 2023			December 31, 2022
Laboratory equipment	$	13,448		$	12,035
Office and computer equipment		1,105			1,078
Leasehold improvements		3,985			1,760
Construction in progress		24			3,984
Total property and equipment		18,562			18,857
Less: accumulated depreciation		(6,831	)		(3,272	)
Property and equipment, net	$	11,731		$	15,585

Schedule of Finite-Lived Intangible Assets [Table Text Block]

	December 31, 2023			December 31, 2022
Developed technology	$	5,000		$	5,000
Intellectual property		80			80
Total cost		5,080			5,080
Less: accumulated amortization		(791	)		(60	)
Intangible assets, net	$	4,289		$	5,020

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

Year Ending December 31,	Amount
2024	$	731
2025		732
2026		731
2027		731
2028		727
Thereafter		637
Total	$	4,289

Schedule of Accrued Liabilities [Table Text Block]

	December 31, 2023		December 31, 2022
Accrued compensation	$	4,576	$	3,112
Accrued clinical and manufacturing expenses		312		2,413
Accrued professional and consulting services		211		691
Accrued other expenses		535		1,868
Total	$	5,634	$	8,084