| Document and Entity Information | Aug. 27, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Aug. 27, 2021 |
| Entity Registrant Name | Rocket Pharmaceuticals, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-36829 |
| Entity Tax Identification Number | 04-3475813 |
| Entity Address, Address Line One | 9 Cedarbrook Drive |
| Entity Address, City or Town | Cranbury |
| Entity Address, State or Province | NJ |
| Entity Address, Postal Zip Code | 08512 |
| City Area Code | 646 |
| Local Phone Number | 440-9100 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001281895 |
| Title of 12(b) Security | Common stock, $0.01 par value |
| Trading Symbol | RCKT |
| Security Exchange Name | NASDAQ |
