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BUSINESS ACQUISITIONS - Acquisition of Pro Forma information (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Summary of unaudited pro forma result of operations |  |
Pro forma net revenue | $ 165,309 | $ 154,124
Pro forma net income attributable to RYB Education, Inc. | $ 380 | $ 9,442
Pro forma net income per ordinary share-basic | $ 0.01 | $ 0.38
Pro forma net income per ordinary share- diluted | $ 0.01 | $ 0.36

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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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