I would also cash out, I would've done it on the pop to 55$. Understand that bubbles happen, and as an investor, one of your most important things to do, isn't to get "WTF AWESOMESAUCE PROFITS", but to, get this, AVOID LOSSES. Any loss incurred is something you have to make up for on a future return. at 90$ a share, ask yourself this honestly: it just rose ~300% in the span of what, 2 months? Do you honestly think the underlying business has improved?(it hasn't). This pop, from what I've read, might be due to heavy short covering. Short squeeze, look it up. And lastly, they are diluting outstanding shares with a secondary share offering at these levels.
Also, the 11 million dollars in profit they've made from this quarter, was due to regulatory rules, not actual profit off of their business(manufacturing or licensing). Though I agree, profit is profit, after so many quarters of their business, a one off 11 million dollar profit is AFAI care, just so much noise.
Disclosure: I'm not saying that I think Tesla is necessarily a bad business, just at valuation levels such as these.... You couldn't keep me in the stock. I'm not about to short it, there's no telling how long it'll take for this bubble to deflate, but is Tesla really worth 1/6 of Ford? 1/3 of GM? Slightly different business... but only slightly, and as a business, a 10 billion dollar valuation is extremely overvalued on any level I can find.
Edit: Didn't realize 2 of the main people in this topic had cashed out, congrats to you guys for your profits! My message still stands for anyone that hasn't realized their gains.