Yes, its certainly not a secret that this one is very crowded. That can be dangerous for those who are short. It depends on your stomach, staying power, and conviction. The internet debacle is a perfect example. The shorts were 100% right on the fundamentals, but many got absolutely trampled on the way up. (i'm not suggesting this company is anything like the internet companies ) There are fundamentals, and then there is stock action and trading. One needs to be aware and on top of both.
The fact that Sunrise has been so heavily shorted is probably good news for longs. It will depend on how many average days trading it will take to cover. Any uptick in price could cause the shorts to have to run for cover pushing the stock price back up.