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NET INCOME/LOSS PER SHARE (Details) | 12 Months Ended
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Dec. 31, 2018 shares
NET INCOME/LOSS PER SHARE |
Anti-dilutive shares that were included in the calculation of diluted net income (loss) per share | 329,166

X
- Definition The number of stock options included in diluted earnings per share. + References No definition available. + Details
Name: | ambo_NumberOfStockOptionsIncludedInDilutedEarningPerShare
Namespace Prefix: | ambo_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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