Zoom Video (ZM) has two revenue streams, the online small customer and long-term company contracts, says Taz Koujalgi. Zoom needs the churn on the smaller and mid-market segment to come down. Big customers are about half of the revenue mix but drive most of the growth, Taz adds. Zoom is also adding new features to attract customers. ZM reports earnings today postmarket. Tom White brings a double diagonal example trade on the stock.