He gave a short summary without getting into the nitty-gritty of the problem.
the choicest or most essential or most vital part of some idea or experience; "the gist of the prosecutor's argument"; "the heart and soul of the Republican Party"; "the nub of the story"
If people get down to the nitty-gritty of a matter, situation, or activity, they discuss the most important, basic parts of it or facts about it. the nitty gritty of everyday politics. the nitty-gritty the basic and practical facts of a subject or activity (Probably based on gritty)
() Uncertain, said to have been used at first by black jazz musicians, perhaps ultimately from reduplication nit and grits (finely ground corn), from Old English grytt, grytta (“coarse meal”).