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Related Party Balances and Transactions (Details 1) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Related Party Transaction [Line Items]    
Revenues $ 14,592 $ 21,542
Expenses:    
Cost of revenues 3,991 5,767
Operating expenses:    
Research and development, net 9,222 7,496
Sales and marketing, net 5,063 6,324
General and administrative 1,647 1,990
Related Party [Member]    
Related Party Transaction [Line Items]    
Revenues 7,958
Expenses:    
Cost of revenues 97 58
Operating expenses:    
Research and development, net 421 241
Sales and marketing, net 72 131
General and administrative 89 115
Capital expenses $ 7 $ 40