| Document and Entity Information | Jun. 01, 2020 |
| Cover [Abstract] | |
| Entity Registrant Name | HUBSPOT INC |
| Amendment Flag | false |
| Entity Central Index Key | 0001404655 |
| Document Type | 8-K |
| Document Period End Date | Jun. 1, 2020 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-36680 |
| Entity Tax Identification Number | 20-2632791 |
| Entity Address, Address Line One | 25 First Street |
| Entity Address, City or Town | Cambridge |
| Entity Address, State or Province | MA |
| Entity Address, Postal Zip Code | 02141 |
| City Area Code | (888) |
| Local Phone Number | 482-7768 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, Par Value $0.001 per share |
| Trading Symbol | HUBS |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
