Employee Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	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%