why would they do an offering for An acquisition if they got a crap load of cash in the bank?
Depends on the size of the acquisition(s). Their burn rate is getting bigger and the time to raise cash is when you don't need it. From their last 10-K:
"Our acquisitions of patents, technology or other assets or companies may involve issuing capital that would be dilutive to our stockholders, cause our stock price to drop, or involve raising capital on unfavorable terms, if available."
Sometimes you just need to take a company at its word when they tell you their intentions.