DoorDash’s sales nearly tripled in the first three months of the year as demand for food delivery remained elevated even as U.S. restaurants reopened their dining rooms. DoorDash said its revenue grew 198% to $1.1 billion in the January-March period. According to analysts polled by FactSet, that was well above Wall Street’s forecast of $994 million. San Francisco-based DoorDash reported a net loss of $110 million because it is still spending heavily to win new customers and expand into other services, like delivery from groceries and convenience stores.