Income Taxes, Uncertain Tax Liabilities (Details) - Foreign [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Uncertain Tax Liabilities, Total [Roll Forward]
Beginning balance	$ 1,774	$ 1,702
Increases	82	116
Decreases	(155)	(44)
Ending balance	1,701	1,774
China [Member]
Tax [Roll Forward]
Beginning balance	203	220
Increases	0	0
Decreases	(5)	(17)
Ending balance	198	203
Interest and Penalties [Roll Forward]
Beginning balance	432	428
Increases	25	4
Decreases	0	0
Ending balance	457	432
South Korea [Member]
Tax [Roll Forward]
Beginning balance	622	644
Increases	0	0
Decreases	(19)	(22)
Ending balance	603	622
Interest and Penalties [Roll Forward]
Beginning balance	386	335
Increases	57	51
Decreases	0	0
Ending balance	443	386
U.K. [Member]
Tax [Roll Forward]
Beginning balance	40	45
Increases	0	0
Decreases	(40)	(5)
Ending balance	0	40
Interest and Penalties [Roll Forward]
Beginning balance	91	30
Increases	0	61
Decreases	(91)	0
Ending balance	$ 0	$ 91