Accrued Severance Benefits, Future Benefits Payments to Employees (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
Future Benefits to Non-Executive Employees [Abstract]
Remainder of 2023	$ 634
2024	906
2025	1,502
2026	1,829
2027	1,718
2028	3,699
2029 - 2033	$ 21,043
Retirement age of employees	60 years
Korea [Member] | Minimum [Member]
Future Benefits to Non-Executive Employees [Abstract]
Korea's mandatory retirement age	60 years