An aspiring entrepreneur hires two interns to help him start his online business, if only they could figure out what the company does. “Good Idea,” directed by Marissa Losoya, is a deadpan satire on start-up culture, and a slow-burn character study of a delusional, wannabe boss. The one-man business is Dixon’s attempt to prove his worth to the world, but it’s not clear what the business even is, or what it requires of its two new interns, Diane and Rob.