Note 2 - Basis of Presentation, Principles of Consolidation and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2024

Notes Tables

Schedule of Error Corrections and Prior Period Adjustments [Table Text Block]

	December 31, 2023
	As reported			Adjustment			As corrected
Net cash provided by financing activities	$	4,651		$	(510	)	$	4,141
Net cash used in operating activities	$	(24,101	)	$	510		$	(23,591	)

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

	December 31,
	2024		2023
Prepaid insurance	$	554	$	564
Vendor prepayments and deposits		331		545
Prepaid sponsored research		11		1,515
Non-trade receivables		16		95
Related-party receivables		4		4
Total prepaid expenses and other current assets	$	916	$	2,723

Schedule of Property, Plant and Equipment Useful Life [Table Text Block]

	Years
Leasehold improvements	Shorter of estimated useful lives or the term of the lease
Computer equipment		2
Software		3
Machinery and equipment		2 to 5
Furniture and office equipment		2 to 7

Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]

Description	Liabilities Measured at Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Other Unobservable Inputs (Level 3)
Fair value of warrant liability:
December 31, 2024	$	5,229	$	—	$	—	$	5,229
December 31, 2023	$	4,855	$	—	$	—	$	4,855

	Warrant Liability Long-Term
December 31, 2022	$	77
Issuances of warrants		3,734
Change in fair value - net		1,044
December 31, 2023	$	4,855
Issuances of warrants		6,111
Warrant amendment		388
Change in fair value - net		(6,125	)
December 31, 2024	$	5,229