Note 12 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

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

	2023		2022
	(in thousands)
Current income taxes
Federal	$	-	$	-
State		-		-
Foreign		196		239
Deferred income taxes		-
Federal		-		-
State		-		-
Foreign		118		79
Total income tax expense	$	314	$	318

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

	2023			2022
	(in thousands)
United States	$	(53,226	)	$	(44,802	)
Foreign		(24,893	)		(30,441	)
Total loss from operations before taxes	$	(78,119	)	$	(75,243	)

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

	2023			2022
	(in thousands)
Deferred Tax assets:
Stock-based compensation	$	3,119		$	2,840
Accrued expenses and other		2,666			2,538
Research credit carryforward		2,859			1,341
Fixed assets		319			162
Capitalized start-up costs and other intangibles		644			921
Capitalized research costs		9,064			4,382
Net operating loss carryforwards		93,332			83,908
		112,003			96,092
Valuation allowance		(110,511	)		(94,704	)
Net deferred tax asset		1,492			1,388
Deferred tax liabilities
Fixed assets and other		(1,448	)		(1,214	)
Net deferred tax liability		(1,448	)		(1,214	)
Net deferred tax asset	$	44		$	174

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

	2023		2022
	(in thousands)
Beginning balance	$	335	$	141
Gross increases for tax positions related to current periods		328		194
Gross decreases related to 382 limitations		52		-
Ending balance	$	715	$	335

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

	2023						2022
	Amount			Percent of Pretax Earnings			Amount			Percent of Pretax Earnings
	(in thousands)
United States federal tax at statutory rate	$	(16,405	)		21.0	%	$	(15,801	)		21.0	%
State taxes (net of deferred benefit)		(2,493	)		3.2	%		(2,912	)		3.9	%
Nondeductible expenses		755			(1.0	%)		1,077			(1.4	%)
Change in fair market value of contingent consideration		244			(0.3	%)		(283	)		0.4	%
Warrant remeasurement and financing costs		(140	)		0.2	%		-			-
Research & development		(1,898	)		2.4	%		(970	)		1.3	%
Change in unrecognized tax benefits		380			(0.5	%)		194			(0.3	%)
Foreign tax rate differential		3,176			(4.1	%)		2,676			(3.6	%)
True-up to stock compensation - cancellations		-			-			49			(0.1	%)
Change in enacted tax rates and other, net		659			(0.8	%)		(96	)		0.0
Change in valuation allowance		16,036			(20.5	%)		16,384			(21.8	%)
Income tax expense (benefit)	$	314			(0.4	%)	$	318			(0.4	%)