Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2022	May 05, 2022
Document And Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q1
Document Quarterly Report	true
Document Transition Report	false
Entity Registrant Name	Talis Biomedical Corporation
Entity Central Index Key	0001584751
Entity Current Reporting Status	Yes
Current Fiscal Year End Date	--12-31
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 Interactive Data Current	Yes
Entity File Number	001-40047
Entity Tax Identification Number	46-3122255
Entity Address, Address Line One	230 Constitution Drive
Entity Address, City or Town	Menlo Park
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94025
City Area Code	650
Local Phone Number	433-3000
Entity Incorporation State Country Code	DE
Title of 12(b) Security	Common Stock, $0.0001 par value per share
Trading Symbol	TLIS
Security Exchange Name	NASDAQ
Entity Stock, Shares Outstanding		56,482,594
Common Stock
Document And Entity Information [Line Items]
Entity Stock, Shares Outstanding		26,618,920
Series 1 Convertible Preferred Stock
Document And Entity Information [Line Items]
Entity Stock, Shares Outstanding		29,863,674