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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Schedule of Effect of Adoption of ASC 606) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Liabilities |  |
Deferred revenues (including current portion) | $ (37,671) | $ (12,796)
Deferred income Tax | 12,127 | 8,398
Shareholders' Equity |  |
Accumulated Deficit | $ (129,580) | (92,065)
New Revenue Standard Adjustment [Member] |  |
Liabilities |  |
Deferred revenues (including current portion) |  | (3,911)
Deferred income Tax |  | 939
Shareholders' Equity |  |
Accumulated Deficit |  | 2,972
Adjusted balances [Member] |  |
Liabilities |  |
Deferred revenues (including current portion) |  | (17,948)
Deferred income Tax |  | 9,337
Shareholders' Equity |  |
Accumulated Deficit |  | $ (89,093)

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