Cash and Investments Held in Trust Account (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Money Market Funds [Member]
Cash and Investments Held in Trust Account (Details) [Line Items]
Investment in company's trust account	$ 15,174,028	$ 1,187,964
U.S. Treasury Securities [Member]
Cash and Investments Held in Trust Account (Details) [Line Items]
Investment in company's trust account		$ 117,857,363

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