Registration statement for securities of certain foreign private issuers

Accounts Receivable and Prepaid Expenses (Details)

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Accounts Receivable and Prepaid Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts Receivable and Prepaid Expenses [Abstract]        
Government authorities     $ 66 $ 22
Prepaid expenses and others     3,093 1,985
Total $ 3,977 $ 3,286 $ 3,159 $ 2,007