Note 4 - Balance Sheet Components (Tables)

3 Months Ended

Mar. 31, 2024

Notes Tables

Cash, Cash Equivalents and Investments [Table Text Block]

	Amortized		Gross Unrealized					Estimated		Cash and		Short-Term
	Cost		Gains		Losses			Fair Value		Cash Equivalents		Investments
March 31, 2024
Cash at banks	$	4,078	$	—	$	—		$	4,078	$	4,078	$	—
Money market funds		17,710		—		—			17,710		17,710		—
U.S. Treasury securities		14,886		—		(10	)		14,876		4,947		9,929
Total	$	36,674	$	—	$	(10	)	$	36,664	$	26,735	$	9,929

	Amortized		Gross Unrealized					Estimated		Cash and		Short-Term
	Cost		Gains		Losses			Fair Value		Cash 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

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]

	March 31, 2024		December 31, 2023
Prepaid clinical and manufacturing expenses	$	1,762	$	984
Unbilled revenue from government contracts		1,596		—
Prepaid insurance		933		258
Prepaid rent		528		488
Interest receivable		140		127
Other		2,105		958
Prepaid expenses and other current assets	$	7,064	$	2,815

Property, Plant and Equipment [Table Text Block]

	March 31, 2024			December 31, 2023
Laboratory equipment	$	13,507		$	13,448
Office and computer equipment		1,105			1,105
Leasehold improvements		3,998			3,985
Construction in progress		226			24
Total property and equipment		18,836			18,562
Less: accumulated depreciation		(7,734	)		(6,831	)
Property and equipment, net	$	11,102		$	11,731

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

	March 31, 2024			December 31, 2023
Developed technology	$	5,000		$	5,000
Intellectual property		80			80
Total cost		5,080			5,080
Less: accumulated amortization		(974	)		(791	)
Intangible assets, net	$	4,106		$	4,289

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

Year Ending December 31,	Amount
2024 (nine months remaining)	$	548
2025		732
2026		731
2027		731
2028		727
Thereafter		637
Total	$	4,106

Schedule of Accrued Liabilities [Table Text Block]

	March 31, 2024		December 31, 2023
Accrued compensation	$	3,199	$	4,576
Accrued clinical and manufacturing expenses		180		312
Accrued professional and consulting services		707		211
Other liabilities, current portion		894		535
Total	$	4,980	$	5,634