I don't think you can say they have "Wasted" $150m.
they invested it into R&D and marketing as well as you may claim subsidising early adopters. They now have a business growing 50% yoYoY targeting $500m a year turnover in 2020, with 14000 EV's powered by GenDrive and millions of hydrogen fills a year. Hardly a waste of investment
They will not need any more cash - they have been accurate for 2 years on their cash forecasts and the new Walmart terms almost certainly carry less restrictive cash terms.
So no need for any cash raise - which if they did ned would probably be done on the market not through share issuance.