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Document and Entity Information - shares
 3 Months Ended
Mar. 31, 2024
May 01, 2024
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2024  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus Q1  
Entity Central Index Key 0001439725  
Current Fiscal Year End Date --12-31  
Document Transition Report false  
Entity File Number 001-39659  
Entity Registrant Name BIODESIX, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 20-3986492  
Entity Address, Address Line One 919 West Dillon Rd  
Entity Address, City or Town Louisville  
Entity Address, State or Province CO  
Entity Address, Postal Zip Code 80027  
City Area Code 303  
Local Phone Number 417-0500  
Title of 12(b) Security Common Stock, par value $0.001 per share  
Trading Symbol BDSX  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   114,685,783