| Document and Entity Information | Oct. 29, 2020 |
| Cover [Abstract] | |
| Entity Registrant Name | BELLICUM PHARMACEUTICALS, INC |
| Security Exchange Name | NASDAQ |
| Amendment Flag | false |
| Entity Central Index Key | 0001358403 |
| Document Type | 8-K |
| Document Period End Date | Oct. 29, 2020 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-36783 |
| Entity Tax Identification Number | 20-1450200 |
| Entity Address, Address Line One | 2710 Reed Road |
| Entity Address, Address Line Two | Ste. 160 |
| Entity Address, City or Town | Houston |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 77051 |
| City Area Code | 832 |
| Local Phone Number | 384-1100 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, par value $0.01 per share |
| Trading Symbol | BLCM |
| Entity Emerging Growth Company | false |
