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NET INCOME/LOSS PER SHARE (Details)	12 Months Ended
	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