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Employee Benefit Plans (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Pension plans for Swedish employees [Member]
Employee Benefit Plans (Textual)
Defined benefit plan contribution, Amount	$ 398,000	$ 306,000	$ 249,000
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	$ 33,000	$ 89,000	$ 81,000
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	$ 10,000	$ 10,000
Defined benefit plan contribution, Percentage	6.00%	6.00%

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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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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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