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Employee Benefit Plans (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Pension plans for Swedish employees [Member]
Employee Benefit Plans (Details) [Line Items]
Defined benefit plan contribution, amount	$ 459,000	$ 395,000
Pension plans for Swedish employees [Member] | Maximum [Member]
Employee Benefit Plans (Details) [Line Items]
Defined benefit plan contribution, percentage	4.50%
Pension plans for Swedish employees [Member] | Minimum [Member]
Employee Benefit Plans (Details) [Line Items]
Defined benefit plan contribution, percentage	30.00%
U.S. Employee 401K Pension Plan [Member]
Employee Benefit Plans (Details) [Line Items]
Defined benefit plan contribution, percentage	6.00%	6.00%
Defined benefit plan contribution, amount	$ 6,000	$ 6,000
Pension Plans for Taiwan Employees [Member]
Employee Benefit Plans (Details) [Line Items]
Defined benefit plan contribution, percentage	6.00%	6.00%
Defined benefit plan contribution, amount	$ 4,000	$ 3,000

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Maximum amount the employee may contribute to a defined contribution plan.

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Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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