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Employee Benefit Plans (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Pension plans for Swedish employees [Member] |  |  |
Employee Benefit Plans (Textual) |  |  |
Defined benefit plan contribution, amount | $ 368,000 | $ 398,000 | $ 306,000
Pension plans for Swedish employees [Member] | Minimum [Member] |  |  |
Employee Benefit Plans (Textual) |  |  |
Defined benefit plan contribution, percentage | 5.00% | 5.00% | 5.00%
Pension plans for Swedish employees [Member] | Maximum [Member] |  |  |
Employee Benefit Plans (Textual) |  |  |
Defined benefit plan contribution, percentage | 15.00% | 15.00% | 15.00%
U.S. Employee 401K Pension Plan [Member] |  |  |
Employee Benefit Plans (Textual) |  |  |
Defined benefit plan contribution, amount | $ 6,000 | $ 33,000 | $ 89,000
Matching contributions by employer | 6.00% | 6.00% | 6.00%
Pension Plans for Taiwan Employees [Member] |  |  |
Employee Benefit Plans (Textual) |  |  |
Defined benefit plan contribution, amount | $ 4,000 | $ 10,000 | $ 10,000
Defined benefit plan contribution, percentage | 6.00% | 6.00% | 6.00%

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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