Abstract: Described herein is N-[4-[4-(4-morpholinyl)-7H-pyrrolo[2,3-d]pyrimidin-6-yl]phenyl]-4-[[3(R)-[(1-oxo-2-propen-1-yl)amino]-1-piperidinyl]methyl]-2-pyridinecarboxamide (Compound A) (Formula I), including crystalline forms, solvates, and pharmaceutically acceptable salts thereof. Also disclosed are pharmaceutical compositions or pharmaceutical formulations that include the compound, as well as methods of using the compound, alone or in combination with other therapeutic agents, for the treatment of autoimmune diseases or conditions, heteroimmune diseases or conditions, cancer, including lymphoma, diabetes, and inflammatory diseases or conditions.