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Revenues (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Deferred revenue and advances from customers $ 1,021 $ 2,601
Trade receivables, net 14,393 20,266
Other accounts receivable and prepaid expenses 2,685 2,685
Accumulated deficit (51,787) $ (53,203)
Adjustments following the adoption of ASC 606 [Member]    
Deferred revenue and advances from customers 80  
Trade receivables, net 233  
Other accounts receivable and prepaid expenses 24  
Accumulated deficit (337)  
Balance as of January 1, 2018 [Member]    
Deferred revenue and advances from customers (2,521)  
Trade receivables, net 20,499  
Other accounts receivable and prepaid expenses 2,709  
Accumulated deficit $ 52,866