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Revenues (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Balance sheets    
Trade receivables, net $ 20,381 $ 20,266
Other accounts receivable and prepaid expenses 1,766 2,685
Deferred revenues and advances from customers 266 2,601
Other accounts payables and accrued expenses 2,281 3,428
Deferred revenues - long term 100 21
Accumulated deficit (55,281) $ (53,203)
Balances before adoption of ASC 606 [Member]    
Balance sheets    
Trade receivables, net 19,845  
Other accounts receivable and prepaid expenses 1,776  
Deferred revenues and advances from customers (596)  
Other accounts payables and accrued expenses (2,268)  
Deferred revenues - long term  
Accumulated deficit 56,024  
Effect of change [Member]    
Balance sheets    
Trade receivables, net 536  
Other accounts receivable and prepaid expenses (10)  
Deferred revenues and advances from customers 330  
Other accounts payables and accrued expenses (13)  
Deferred revenues - long term (100)  
Accumulated deficit $ 55,281