Note 15 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2024

Notes Tables

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

	Year Ended December 31,
	2024			2023
Domestic	$	(27,044	)	$	(35,039	)
International		(11,922	)		(10,716	)
Loss before income taxes	$	(38,966	)	$	(45,755	)

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

	Year Ended December 31,
	2024			2023
Current:
Federal	$	5		$	(141	)
State		(13	)		(9	)
Foreign		(36	)		(37	)
Sub-total	$	(44	)	$	(187	)
Deferred:
Federal	$	—		$	(17	)
State		—			—
Foreign		—			—
Sub-total	$	—		$	(17	)
Total	$	(44	)	$	(204	)

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	Year Ended						Year Ended
	December 31,						December 31,
	2024			%			2023			%
Income taxes computed at statutory rates	$	8,183			(21	)%	$	9,609			(21	)%
(Increases) decreases resulting from:
Change in valuation allowance		(9,319	)		24	%		(11,716	)		26	%
NOL surrendered for refundable tax credit		(1,355	)		4	%		(1,607	)		4	%
Foreign research deductions and credits		650			(2	)%		803			(2	)%
Federal and state research and experimentation credits		1,288			(3	)%		1,412			(3	)%
State income taxes, net of federal tax benefit		(139	)		—	%		468			(1	)%
Other		648			(2	)%		827			(3	)%
Total	$	(44	)		—	%	$	(204	)		—	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	December 31,			December 31,
	2024			2023
Deferred tax assets:
Federal and state net operating losses	$	79,856		$	77,201
Federal and state research and experimentation credits		13,610			12,406
Research and experimental costs		12,806			9,458
Stock based compensation		1,822			1,474
ASC 842 - lease liabilities		1,303			1,468
Accrued compensation		324			610
Fixed asset differences		191			185
Intangible asset differences		4			—
Other		264			59
Total gross deferred tax assets		110,180			102,861
Less valuation allowance		(104,361	)		(95,256	)
Net deferred tax assets	$	5,819		$	7,605
Deferred tax liabilities:
Patent expenditures	$	(888	)	$	(1,096	)
ASC 842 - right of use assets		(795	)		(897	)
Fixed asset differences		(4	)		(9	)
Intangible asset differences		(4,132	)		(5,603	)
Total gross deferred tax liabilities	$	(5,819	)	$	(7,605	)
Total net deferred tax assets and liabilities	$	—		$	—

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

	Year Ended December 31,
	2024			2023
Beginning balance	$	1,063		$	1,046
Addition for current year tax positions		85			94
Addition for prior year tax positions		—			—
Reduction for prior year positions		(11	)		(77	)
Reduction for prior year positions resolved during the current year		—			—
Ending balance	$	1,137		$	1,063