Cash and Investments Held in Trust Account (Details Textual) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
United States Money Market funds [Member]
Cash and Investments Held in Trust Account (Textual)
Investment in company’s trust account	$ 1,004	$ 31,335
U.S. Treasury Securities [Member]
Cash and Investments Held in Trust Account (Textual)
Investment in company’s trust account	$ 116,705,908	$ 114,848,797

The amount of investment in the Company’s Trust Account.

No definition available.

Name:	ALAC_InvestmentInCompanysTrustAccount
Namespace Prefix:	ALAC_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant