Note O - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

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

	Years ended December 31,
	2023			2022			2021
Domestic	$	(52,886	)	$	(45,404	)	$	(21,229	)
Foreign		(3,153	)		(20,992	)		(32,931	)
Total loss before income taxes	$	(56,039	)	$	(66,396	)	$	(54,160	)

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

Current:	2023		2022		2021
Federal	$	—	$	—	$	—
State		1		1		2
Foreign		8		—		—
Total	$	9	$	1	$	2
Deferred:
Federal	$	—	$	—	$	—
State		—		—		—
Foreign		—		—		—
Total	$	—	$	—	$	—
Income tax (benefit) expense	$	9	$	1	$	2

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

	2023			2022
NOL carryforward	$	49,469		$	47,901
Inventory reserves		3,195			2,892
Unrealized gains and losses		355			363
Share-based compensation		1,013			914
Foreign tax credit		4,599			4,599
Research and development credits		10,998			10,505
Capitalized research and development		8,717
Interest		5,659			3,966
ASC 842 Assets		1,561			1,602
Other		941			776
Deferred tax assets		86,507			73,518
Less valuation allowance		(78,124	)		(69,680	)
Deferred tax assets, net		8,383			3,838
Depreciation and amortization		(6,992	)		(2,441	)
ASC 842 Liabilities		(1,391	)		(1,397	)
Deferred tax liabilities		(8,383	)		(3,838	)
Deferred tax assets, net	$	—		$	—

Summary of Valuation Allowance [Table Text Block]

	2023			2022			2021
Beginning Balance, January 1	$	69,680		$	57,721		$	43,462
Change charged to expense/(income)		8,755			14,196			13,822
Change charged to currency translation adjustment		(311	)		(2,237	)		437
Ending Balance, December 31	$	78,124		$	69,680		$	57,721

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

	2023			2022			2021
Expected taxes at statutory rate	$	(11,768	)	$	(13,943	)	$	(11,374	)
PPP loan forgiveness		—			—			(1,308	)
Non-deductible/non-taxable items		57			33			897
Global intangible low-taxed incom		2,568
Foreign rate differences		242			552			107
Foreign permanent differences		(1,212	)		(1,407	)		(1,320	)
Changes in valuation allowance		8,755			14,196			13,822
Share-based compensation		729			879			468
Research and development credits		(492	)		(626	)		(872	)
Extinguishment of debt		1,580			—			—
Foreign other		—			—			—
Other, net		(450	)		317			(418	)
Tax (benefit) expense	$	9		$	1		$	2

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

	2023		2022		2021
Unrecognized tax benefits — January 1	$	181	$	181	$	181
Gross increases — tax positions in prior period		—		—		—
Gross decreases — tax positions in prior period		—		—		—
Unrecognized tax benefits — December 31	$	181	$	181	$	181