v3.20.1

Interest, advances and promissory notes payable (Details) - Interest Payable - USD ($)	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest Payable [Abstract]
Relatives of directors	$ 2,955,262	$ 2,876,280
Non-related parties	2,541,953	2,488,717
Total	$ 5,497,215	$ 5,364,997	$ 4,836,127	$ 4,836,127

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- References

No definition available.

+ Details

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X

- Definition

Carrying value as of the balance sheet date of [accrued] interest payable to relatives of directors on all forms of debt, including trade payables, that has been incurred and is unpaid.

+ References

No definition available.

+ Details

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Period Type:	instant

X

- Definition

Carrying value as of the balance sheet date of [accrued] interest payable to non-related parties on all forms of debt, including trade payables, that has been incurred and is unpaid.

+ References

No definition available.

+ Details

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Namespace Prefix:	alrt_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

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

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