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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2021
Feb. 14, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2021    
Entity File Number 001-9025    
Entity Registrant Name VISTA GOLD CORP.    
Entity Incorporation, State or Country Code A1    
Entity Tax Identification Number 98-0542444    
Entity Address, Address Line One 7961 Shaffer Parkway, Suite 5    
Entity Address, City or Town Littleton    
Entity Address, State or Province CO    
Entity Address, Postal Zip Code 80127    
City Area Code 720    
Local Phone Number 981-1185    
Title of 12(b) Security Common Shares, no par value    
Trading Symbol VGZ    
Security Exchange Name NYSEAMER    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
ICFR Auditor Attestation Flag false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   117,189,232  
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000783324    
Amendment Flag false    
Entity Public Float     $ 85,760,855
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Auditor Name Plante & Moran, PLLC    
Auditor Firm ID 166    
Auditor Location Denver, Colorado