XML 119 R105.htm IDEA: XBRL DOCUMENT v3.19.1
Employee benefits (Details 3) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Interest expense   $ 313
Cost of revenues $ 554,690 518,142
Research and development 123,037 117,662
General and administrative 21,823 20,461
Sales and marketing 20,380 20,388
Defined Benefit Plan [Member]    
Current service costs 20 15
Interest expense 19 19
Total 39 34
Cost of revenues 14 9
Research and development 18 17
General and administrative 4 5
Sales and marketing 3 3
Total Expenses $ 39 $ 34