10. Comparative Figures	3 Months Ended
Mar. 31, 2012
Comparative Figures	10. Comparative Figures Certain comparative figures have been reclassified to conform to the current period’s presentation.

The entire disclosure for the general note to the financial statements for the reporting entity which includes a description of certain comparative figures being reclassified to conform with the current period's presentation.

No definition available.

Name:	alrt_ComparativeFigures
Namespace Prefix:	alrt_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration