Note 2 - Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2024

Notes Tables

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	Fair Value Measured as of September 30, 2024 Using:
	Adjusted Cost		Unrealized Gains		Fair Value		Cash and Cash Equivalent		Marketable Securities
Assets
Level 1
Money market funds	$	4,774	$	—	$	4,774	$	4,774	$	—
Level 2
Corporate bonds		10,469		20		10,489		—		10,489
Commercial paper		3,697		3		3,700		—		3,700
U.S. Government securities		2,391		4		2,395		—		2,395
Total financial assets	$	21,331	$	27	$	21,358	$	4,774	$	16,584
Liabilities
Level 2
Private placement warrant liability	$	—	$	—	$	—	$	—	$	—
Level 3
Derivative warrant liability		—		—		30		—		—
Total financial liabilities	$	—	$	—	$	30	$	—	$	—

	Fair Value Measured as of December 31, 2023 Using:
	Adjusted Cost		Unrealized Gains		Fair Value		Cash and Cash Equivalent		Marketable Securities
Assets
Level 1
Money market funds	$	16,377	$	—	$	16,377	$	16,377	$	—
Level 2
Corporate bonds		2,880		1		2,881		—		2,881
Commercial paper		8,809		5		8,814		—		8,814
U.S. Government securities		7,892		4		7,896		—		7,896
Total financial assets	$	35,958	$	10	$	35,968	$	16,377	$	19,591
Liabilities
Level 2
Private placement warrant liability	$	—	$	—	$	—	$	—	$	—
Level 3
Derivative warrant liability		—		—		26		—		—
Total financial liabilities	$	—	$	—	$	26	$	—	$	—

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

	Derivative Warrant Liability
Balance at December 31, 2023	$	26
Additions		—
Change in fair value included in other income (expense), net		4
Balance at September 30, 2024	$	30

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

	September 30, 2024
Expected term (years)		2.0
Expected volatility		227.7	%
Risk-free interest rate		3.7	%
Dividend yield		—	%
Exercise price	$	105.00