3. Interest, Advances and Promissory Notes Payable (Detail) - Unrelated Lenders (USD $)	Dec. 31, 2012	Dec. 31, 2011
Unsecured promissory notes payable to unrelated lenders:
	$ 2,424,353	$ 2,424,353
Promissory notes payable, secured by a guarantee from a director and relative of a director, bearing interest at 1% per month, with $200,000 repayable on July 31, 2003, all due on demand	230,000	230,000
Total Arms Length Promissory Notes	$ 2,424,353	$ 2,424,353

Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable due to a lender secured by a guarantee from a director and relative of a director, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

No definition available.

Name:	alrt_PromissoryNotesPayableSecuredbyaGuaranteefromaDirectorandRelativeofaDirector
Namespace Prefix:	alrt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant