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Other Accounts Receivable and Prepaid Expenses (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Other Accounts Receivable and Prepaid Expenses [Abstract] |  |
Indirect taxes | $ 118 | $ 58
Grant receivables | 740 | 46
Prepaid expenses and advances to suppliers | 460 | 708
Related party (see note 12a5) | 2 | 585
Tax balance to receive from customers | 862 | 461
Project deferred costs | 372 |
Others | 131 | 102
Other accounts receivable and prepaid expenses | $ 2,685 | $ 1,960

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