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Related Party Balances and Transactions (Details Textual) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Related Party Balances and Transactions (Textual)    
Revenues aggregated total amount $ 55
Aggregate net amounts of lease and maintenance expenses 447 475
Administrative and IT services amount 15 15
Salary expenses 53 55
Revenues amount in AT&T engagement $ 7,903
Affiliates amount of related party 164  
Additional capital expenditures $ 7