Extent to which Thomas à Kempis is venerated in the Catholic Church?

According to [*Wikipedia*](https://en.wikipedia.org/wiki/Thomas_à_Kempis) Thomas à Kempis, the presumed author of *The Imitation of Christ*, is venerated in the Catholic Church. I surmise that his cause for canonization must have been brought up at least two hundred years after his death, as his body was (I am assuming the story is true) exhumed, upon which scratch marks on the wood of the coffin were discovered, as well as some remnants of the wood under his fingernails. Confusion purportedly arose and his cause for canonization seems to have been dropped. Question: **Was Thomas a Kempis ever officially declared a *Servant of God* in the Catholic Church? Was he ever officially declared *Venerable* or *Blessed*?** I am guessing that he must have been at least declared a Servant of God, but I am not sure.