What does 2 Kings 18:4 mean?

He tore down the high places, smashed the sacred stones, and cut down the Asherah poles. He even broke into pieces the bronze snake Moses had made, because the Israelites had started burning incense to it. They called it Nehushtan. 2 Kings 18:4 - Modern Text Bible

(Hezekiah goes further than most kings by removing all the places and objects people used for idol worship, even destroying something Moses had made because it had become an idol.)