Cover Page	Mar. 02, 2021
Cover [Abstract]
Document Type	8-K
Document Period End Date	Mar. 02, 2021
Entity Registrant Name	PULMONX CORPORATION
Entity Incorporation, State or Country Code	DE
Entity File Number	001-39562
Entity Tax Identification Number	77-0424412
Entity Address, Address Line One	700 Chesapeake Drive
Entity Address, Postal Zip Code	94063
Entity Address, State or Province	CA
Entity Address, City or Town	Redwood City,
City Area Code	650
Local Phone Number	364-0400
Written Communications	false
Soliciting Material	false
Pre-commencement Tender Offer	false
Pre-commencement Issuer Tender Offer	false
Title of 12(b) Security	Common Stock, $0.001 par value
Trading Symbol	LUNG
Security Exchange Name	NASDAQ
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Central Index Key	0001127537
Amendment Flag	false