| Document and Entity Information | Aug. 04, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Aug. 4, 2020 |
| Entity Registrant Name | NEURONETICS, INC. |
| Entity Central Index Key | 0001227636 |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Entity File Number | 001-38546 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 33-1051425 |
| Entity Address, Address Line One | 3222 Phoenixville Pike |
| Entity Address, City or Town | Malvern |
| Entity Address, State or Province | PA |
| Entity Address, Postal Zip Code | 19355 |
| City Area Code | 610 |
| Local Phone Number | 640-4202 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of each class | Common Stock ($0.01 par value) |
| Trading Symbol | STIM |
| Name on each exchange on which registered | NASDAQ |
