TSLA rose on the news despite diluting shareholders is because coupled with the announcement, Elon Musk mentions that he will personally put an additional 100mil into the secondary offer; and general exuberance that TSLA will use the cash for more infrastructure build-out, a la Google, Yahoo during their heyday's. Make no mistake, this is as much a PR ploy by Tesla to pump up their offering.
It's incredibly smart for Musk and company to raise money in a very favorable environment as TSLA climbed from 45 to 90 after earnings. However, it remains to be seen if they can be still profitable. Note that they are still selling each car at a material loss; and only managed to show a profitable quarter by trading green credits they gained from their manufacturing. To truly scale, they need to either drive down the production cost of their cars down and broaden their market as there are only so much supply of carbon-emission credits on the market.
Disclosure: I trade TSLA options on volatility, without any directional bias.