Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2020	Apr. 29, 2020
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Entity Registrant Name	Vapotherm Inc
Entity Central Index Key	0001253176
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Common Stock, Shares Outstanding		21,299,512
Entity Shell Company	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity File Number	001-38740
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	46-2259298
Entity Address, Address Line One	100 Domain Drive
Entity Address, City or Town	Exeter
Entity Address, State or Province	NH
Entity Address, Postal Zip Code	03833
City Area Code	603
Local Phone Number	658-0011
Document Quarterly Report	true
Document Transition Report	false
Title of 12(b) Security	Common Stock, $0.001 par value per share
Trading Symbol	VAPO
Security Exchange Name	NYSE