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Business Combination, Significant Transaction and Sale of Business (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Oct. 31, 2016 | Jul. 11, 2016 | Jun. 30, 2015 | Apr. 14, 2015
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Business Acquisition [Line Items] |  |  |  |  |  |
Net assets, excluding cash acquired | $ 306 | $ (1,822) |  |  |  |
Intangible assets | 23 | 1,149 |  |  |  |
Goodwill | 259 | 1,723 |  |  |  |
Total assets acquired | $ 588 | $ 1,050 |  |  |  |
Shavit Software Ltd [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Net assets, excluding cash acquired |  |  | $ 533 |  |  |
Intangible assets |  |  | 3,489 |  |  |
Deferred tax liability |  |  | (871) |  |  |
Goodwill |  |  | 3,685 |  |  |
Total assets acquired |  |  | $ 6,836 |  |  |
Roshtov Software Industries Ltd [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Net assets, excluding cash acquired |  |  |  | $ 15 |  |
Redeemable Non-controlling interest |  |  |  | (14,012) |  |
Intangible assets |  |  |  | 22,439 |  |
Deferred tax liability |  |  |  | (5,610) |  |
Goodwill |  |  |  | 17,718 |  |
Total assets acquired |  |  |  | $ 20,550 |  |
Infinigy Solutions LLC [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Net assets, excluding cash acquired |  |  |  |  | $ 1,182 |
Redeemable Non-controlling interest |  |  |  |  | (3,590) |
Intangible assets |  |  |  |  | 3,675 |
Goodwill |  |  |  |  | 5,260 |
Total assets acquired |  |  |  |  | $ 6,527 |
Comblack IT Ltd. [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Net assets, excluding cash acquired |  |  |  |  |  | $ (405)
Redeemable Non-controlling interest |  |  |  |  |  | (989)
Intangible assets |  |  |  |  |  | 1,249
Goodwill |  |  |  |  |  | 1,966
Total assets acquired |  |  |  |  |  | $ 1,821

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