What is the author's style in This Is Our Youth by Kenneth Lonergan?

The plot advances through dialogue rather than action, which occurs offstage. The dialogue reinforces the sense of the characters' self-absorption, especially in the case of Dennis, who pays little attention to what the others are saying. This occurs most notably at the end of the play, when Warren has just delivered a heartfelt monologue about his father's reaction to his sister's death. Dennis's response to Warren's question about his father being “totally by himself” is “I guess,” followed quickly by his attempt to shift the focus back to himself and his fear that Warren thinks ill of him.