| Document and Entity Information | Feb. 26, 2020 |
| Cover [Abstract] | |
| Entity Address, Address Line Two | 1st Floor |
| Amendment Flag | false |
| Entity Central Index Key | 0001611647 |
| Document Type | 8-K |
| Document Period End Date | Feb. 26, 2020 |
| Entity Registrant Name | FRESHPET, INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-36729 |
| Entity Tax Identification Number | 20-1884894 |
| Entity Address, Address Line One | 400 Plaza Drive |
| Entity Address, City or Town | Secaucus |
| Entity Address, State or Province | NJ |
| Entity Address, Postal Zip Code | 07094 |
| City Area Code | (201) |
| Local Phone Number | 520-4000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock |
| Trading Symbol | FRPT |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
