[sah88]

Probably taxes. There are non-trivial tax credits for R&D spending. My guess is they shoehorned as much of their costs into R&D as they could. You can see they got 1.2 million in R&D credits in 2013 in the referenced document.

[necubi]

Right. It's SOP for tech companies to list basically all of engineering as R&D for tax purposes.