Firstly the funding for hospitals might be cut. Which would make selling to more hospitals harder.
They appear to be a one trick pony, which has been great, yet there might need to be a better product range or solution range to keep growth happening.
They might buy another company out which might solve the above.
Perhaps the hospitals might think "HPV is around with sexually active people anyway so this new improvement is a sales pitch", which might make it harder to sell.
Did I say budget restrictions?
Another might be their patented technology. Patents dont last forever, and it might be only a few years away before competitors can copy....ie Think Nespresso and the amount of generic pods available to their older machines. If hospitals do not upgrade to the latest machines the same might happen to NAN.
I admit I have not looked at their competitors but I think there is likely bucketloads of bigger, better capitalised ones to steal the market..
Why do all of the companies I research have bigger bear cases than bull ones!!!! Jeez!!!