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Employee Benefit Plans (Details) - USD ($) | 12 Months Ended
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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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- Definition Maximum amount the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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