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Cover
Jan. 09, 2023
Cover [Abstract]  
Document Type 8-K
Document Period End Date Jan. 09, 2023
Entity Registrant Name EXAGEN INC.
Entity Incorporation, State or Country Code DE
Entity File Number 001-39049
Entity Tax Identification Number 20-0434866
Entity Address, Address Line One 1261 Liberty Way
Entity Address, City or Town Vista
Entity Address, State or Province CA
Entity Address, Postal Zip Code 92081
City Area Code 760
Local Phone Number 560-1501
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, par value $0.001 per share
Trading Symbol XGN
Security Exchange Name NASDAQ
Entity Emerging Growth Company true
Entity Ex Transition Period false
Entity Central Index Key 0001274737
Amendment Flag false