high concept

Short definition from Wiktionary

Noun

1. 1
   An appealing and easily communicable idea for a work (such as a book, film, or television programme).
2. 2
   A style of work (such as a book, film, or television programme) characterized by appealing and easily communicable ideas.
3. 3
   The overarching idea or theme of a work, particularly one perceived as highly artistic or intellectual.

Adjective

1. 1
   Alternative form of high-concept.
2. 2
   Of a work such as a book, film, or television programme: based on an appealing and easily communicable idea; also, of or relating to such a work.
3. 3
   Based on an idea or theme, especially one regarded as highly artistic or intellectual.