The "junk bond" rating and high debt load makes me a little nervous, but maybe that's irrelevant and this is just them raising money as an accelerant because they can get it at a good price?
"The company burned through $1.16 billion in cash in the second quarter [...] a little more than $3 billion in cash on hand"
https://www.bloomberg.com/news/articles/2017-08-02/tesla-bur...