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Summary of Significant Accounting Policies (Schedule of consolidated balance sheet) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Operating leases right-of-use | $ 3,783 |
Prepaid expenses | 553 | $ 884
Operating lease liabilities | $ (3,783) |
According to the previous accounting policy [Member] |  |
Operating leases right-of-use |  |
Prepaid expenses |  | 90
Operating lease liabilities |  |
The change [Member] |  |
Operating leases right-of-use |  | 3,424
Prepaid expenses |  | (90)
Operating lease liabilities |  | (3,334)
As presented according to Topic 842 [Member] |  |
Operating leases right-of-use |  | 3,424
Prepaid expenses |  |
Operating lease liabilities |  | $ (3,334)

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