I didn't really think of New Relic as "Enterprise Software". They are a SaaS Company. Most of the reason enterprise software has so little R&D is because they spend all their resources customizing deployments for enterprise customers.
i think enterprise and SaaS are orthogonal descriptions. new relic is definitely enterprise - as opposed to consumer (ala, dropbox). That their product is a SaaS offering doesn't really make any difference.
They spend as much on General Administrative as they do on R&D and they spend 3.6x , more on marketing and sales then they do on R&D.