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Revenues (Details 2) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Balance sheets    
Trade receivables, net $ 14,393 $ 20,266
Other accounts receivable and prepaid expenses 2,635 2,685
Employees and payroll accruals 4,052 4,062
Deferred revenues and advances from customers 1,021 2,601
Other accounts payables and accrued expenses 2,275 3,428
Deferred revenues - long term 100 21
Accumulated deficit (51,787) $ (53,203)
Balances before adoption of ASC 606 [Member]    
Balance sheets    
Trade receivables, net 13,593  
Other accounts receivable and prepaid expenses 2,648  
Employees and payroll accruals (3,998)  
Deferred revenues and advances from customers (1,560)  
Other accounts payables and accrued expenses (2,211)  
Deferred revenues - long term  
Accumulated deficit 52,895  
Effect of change [Member]    
Balance sheets    
Trade receivables, net 800  
Other accounts receivable and prepaid expenses (13)  
Employees and payroll accruals (54)  
Deferred revenues and advances from customers 539  
Other accounts payables and accrued expenses (64)  
Deferred revenues - long term (100)  
Accumulated deficit $ (1,108)