v3.20.1
Document And Entity Information - USD ($)
12 Months Ended
Dec. 31, 2019
Mar. 27, 2020
Jun. 30, 2019
Document and Entity Information [Abstract]      
Entity Registrant Name ALR Technologies Inc.    
Document Type 10-K    
Current Fiscal Year End Date --12-31    
Emerging Growth Company false    
Entity Small Business true    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   270,777,909  
Entity Public Float     $ 10,831,116
Amendment Flag false    
Entity Central Index Key 0001087022    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Non-accelerated Filer    
Entity Well-known Seasoned Issuer No    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY