| Cover - USD ($) | 12 Months Ended | ||
| Dec. 31, 2023 | Mar. 21, 2024 | Jun. 30, 2023 | |
| Cover [Abstract] | |||
| Document Type | 10-K/A | ||
| Amendment Flag | false | ||
| Document Annual Report | true | ||
| Document Transition Report | false | ||
| Document Period End Date | Dec. 31, 2023 | ||
| Document Fiscal Period Focus | FY | ||
| Document Fiscal Year Focus | 2022 | ||
| Current Fiscal Year End Date | --12-31 | ||
| Entity File Number | 001-36598 | ||
| Entity Registrant Name | CELLECTAR BIOSCIENCES, INC. | ||
| Entity Central Index Key | 0001279704 | ||
| Entity Tax Identification Number | 04-3321805 | ||
| Entity Incorporation, State or Country Code | DE | ||
| Entity Address, Address Line One | 100 Campus Drive | ||
| Entity Address, City or Town | Florham Park | ||
| Entity Address, State or Province | NJ | ||
| Entity Address, Postal Zip Code | 07932 | ||
| City Area Code | 608 | ||
| Local Phone Number | 441-8120 | ||
| Title of 12(b) Security | Common Stock, par value $0.00001 | ||
| Trading Symbol | CLRB | ||
| Security Exchange Name | NASDAQ | ||
| Entity Well-known Seasoned Issuer | No | ||
| Entity Voluntary Filers | No | ||
| Entity Current Reporting Status | Yes | ||
| Entity Interactive Data Current | Yes | ||
| Entity Filer Category | Non-accelerated Filer | ||
| Entity Small Business | true | ||
| Entity Emerging Growth Company | false | ||
| Entity Shell Company | false | ||
| Entity Public Float | $ 18,922,339 | ||
| Entity Common Stock, Shares Outstanding | 32,260,510 | ||
| ICFR Auditor Attestation Flag | false | ||
| Auditor Name | Baker Tilly US, LLP | ||
| Auditor Location | Philadelphia, PA | ||
| Auditor Firm ID | 23 |
