This is wrong. They make a positive margin on every Model S they sell. However their capital expenditures are staggering. There's a reason you can't just start a car company. The sheer amount of capital needed to establish the infrastructure to sell the first car is literally billions of dollars. Tesla has been doing years of R&D in addition to retrofitting the old NUMMI plant in Fremont, building the Gigafactory, and building out the Supercharger network. Conservative estimates currently put the amount of capital that Tesla will burn before the first Model 3 rolls out of the Fremont factory at $5.4 billion and that will certainly be a lowball figure by the time it really happens. Even with $120 billion banked, Apple isn't exactly rushing to announce the Apple Car because you don't just decide to piss away billions.
Tesla has spent the money the major worldwide car manufacturers have refused to because GM, Ford, Fiat Chrysler, Toyota, Nissan, BMW, Audi, Volkswagen, Tata, Hyundai, Kia, etc. just didn't want to spend the billions for something there was uncertain demand for. The Model 3's preorders have proven there is demand, but then you realize that over 17 million cars were sold in the United States and 75 million worldwide in 2015 and suddenly the 300,000 preorders for Model 3 become the drop in the bucket that they truly are. The worldwide automobile industry is absolutely massive, and trying to suddenly turn it around from ICEs to EVs is like trying to make an oil tanker do a three-point turn in the English Channel. Tesla is a hugely disruptive company but the world's automakers still need to seriously invest in EVs before the world's 7 billion humans will start driving them en-masse. Every dollar Tesla loses on the way to the Model 3 is in the service of humanity, because there's only a finite amount of oil in the ground and the Earth will only tolerate so much CO2 spewing into the atmosphere before the climate changes to one uninhabitable by humans. So no, Tesla doesn't need to start making money anytime soon.