v3.20.1

Interest, advances and promissory notes payable (Details) - Summary of Interest Payable Activity - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Summary of Interest Payable Activity [Abstract]
Beginning Balance	$ 5,364,997	$ 4,836,127
Interest incurred on promissory notes payable	132,218	528,870
Ending Balance	$ 5,497,215	$ 5,364,997

X

- Definition

The cost of borrowed funds accounted for as interest that was charged against earnings during the period.

+ References

No definition available.

+ Details

Name:	alrt_InterestExpenseIncurredonPromissoryNotesandOtherPayables
Namespace Prefix:	alrt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	alrt_SummaryOfInterestPayableActivityAbstract
Namespace Prefix:	alrt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of interest payable on debt, including, but not limited to, trade payables.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15(5))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.15(a))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

+ Details

Name:	us-gaap_InterestPayableCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant