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ADDITIONAL INFORMATION - CONDENSED FINANCIAL STATEMENTS - Narrative (Details) - CNY (¥) ¥ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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PRC subsidiaries and VIEs [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Restricted Net Asset | ¥ 517,713 | ¥ 601,547

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- Definition Total amount of restricted net asset of subsidiaries. + References No definition available. + Details
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Namespace Prefix: | ambo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | srt_CondensedFinancialStatementsCaptionsLineItems
Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_ConsolidatedEntitiesAxis=ambo_PrcSubsidiariesAndViesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |