Are the 16 stages of Insight mentioned by the Buddha in the early Pali texts or are they a later addition to the Dharma?

I am reading Practical Insight Meditation: Basic and progressive stages by Mahasi Sayadaw. In the book he elaborates on the 16 stages of insight meditation as a kind of road map of what to expect. I was wondering if these stages are part of the Theravada tradition or an integral part of the Dharma canon.