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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2020
Mar. 12, 2021
Cover [Abstract]    
Document Type 10-K  
Amendment Flag false  
Document Annual Report true  
Document Period End Date Dec. 31, 2020  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus FY  
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 2970 Wilderness Place  
Entity Address, Address Line Two Suite 100  
Entity Address, City or Town Boulder  
Entity Address, State or Province CO  
Entity Address, Postal Zip Code 80301  
City Area Code 303  
Local Phone Number 417-0500  
Title of 12(b) Security Common Stock, par value $0.001 per share  
ICFR Auditor Attestation Flag false  
Trading Symbol BDSX  
Security Exchange Name NASDAQ  
Entity Well Known Seasoned Issuer No  
Entity Voluntary Filers Yes  
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   26,577,782
Entity Public Float $ 344,635,079  
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Company’s definitive Proxy Statement for its 2021 Annual Meeting of Shareholders are to be incorporated by reference into Part

III, as specifically set forth in Part III.)