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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($)
CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY |
Issuance cost, net | $ 4,492

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- Definition The amount of stock issuance cost. + References No definition available. + Details
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Namespace Prefix: | ryb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration