I've been doing some research on blow ups like this. Usually, companies whose stock declines 50%+ in one day with sufficient market caps tend to do ok over the year; the caveat is if it's related to a major accounting scandal. Those eventually go bankrupt or trade down 50-80% more. I would just watch this one from the sidelines and see what it does. 50% down from an earnings or revenue misses tend to outperform in the next 6 months.