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Document And Entity Information (USD $)
6 Months Ended
Jun. 30, 2012
Aug. 14, 2012
Document and Entity Information [Abstract]    
Entity Registrant Name ALR Technologies Inc.  
Document Type 10-Q  
Current Fiscal Year End Date --12-31  
Entity Common Stock, Shares Outstanding   213,977,909
Entity Public Float   $ 106,997,178
Amendment Flag true  
Amendment Description The sole purpose of this Amendment to the Quarterly Report on Form 10-Q of ALR Technologies, Inc. for the period ended June 30, 2012, filed with the Securities and Exchange Commission (“SEC”) on August 14, 2012, is to furnish Exhibit 101 to the Form 10-Q in accordance with Rule 405(a)(2) of Regulation S-T. Exhibit 101 consists of the interactive data files that were not included with the Form 10-Q, as allowed by the 30-day grace period for the first quarterly period in which detailed footnote tagging is required. This amendment does not otherwise change or update the disclosures set forth in the Form 10-Q as originally filed and does not otherwise reflect events occurring after the original filing of the Form 10-Q.  
Entity Central Index Key 0001087022  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Filer Category Smaller Reporting Company  
Entity Well-known Seasoned Issuer No  
Document Period End Date Jun. 30, 2012  
Document Fiscal Year Focus 2012  
Document Fiscal Period Focus Q2