| Document and Entity Information | Dec. 01, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Dec. 1, 2020 |
| Entity Registrant Name | Vapotherm, Inc. |
| Entity Central Index Key | 0001253176 |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of each class | Common Stock, $0.001 per value per share |
| Trading Symbol | VAPO |
| Name of each exchange on which registered | NYSE |
