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Employee Benefit Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
U.S. Employee 401K Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan contribution, amount | $ 6 | $ 6
Defined benefit plan contribution, percentage | 6.00% | 6.00%
Pension plans for Swedish employees [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan contribution, amount | $ 395 | $ 413
Pension plans for Swedish employees [Member] | Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan contribution, percentage | 5.00% | 5.00%
Pension plans for Swedish employees [Member] | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan contribution, percentage | 15.00% | 15.00%
Pension Plans for Taiwan Employees [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan contribution, amount | $ 3 | $ 4
Defined benefit plan contribution, percentage | 6.00% | 6.00%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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