XML 80 R68.htm IDEA: XBRL DOCUMENT v3.10.0.1
Employee Benefit Plans (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
U.S. Employee 401K Pension Plan [Member]    
Employee Benefit Plans (Textual)    
Defined benefit plan contribution, amount $ 6,000 $ 6,000
Matching contributions by employer 6.00% 6.00%
Pension plans for Swedish employees [Member]    
Employee Benefit Plans (Textual)    
Defined benefit plan contribution, amount $ 413,000 $ 368,000
Pension plans for Swedish employees [Member] | Minimum [Member]    
Employee Benefit Plans (Textual)    
Defined benefit plan contribution, percentage 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%
Pension Plans for Taiwan Employees [Member]    
Employee Benefit Plans (Textual)    
Defined benefit plan contribution, amount $ 4,000 $ 4,000
Defined benefit plan contribution, percentage 6.00% 6.00%