All the writing systems I'm familiar with (e.g. hieroglyphics, Sumerian cuneiform, Chinese) have very limited ideographic content. Instead, a limited vocabulary of ideograms (up to a few hundred) are used to make rebuses of the words that don't have ideograms of their own, turning the ideograms into phonetics. As far as I know, this rebus principle is present as far back as we have records of people writing actual language (as opposed to, say, calendars or general ledgers).
Do you have pointers to discussion of purely-ideographic language writing with no phonetic component?