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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 |

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