Disclosure from the 10-K:
----- "Our commercial prototypes do not satisfy all of our performance expectations, and we need to continue to improve various aspects of our PbC technology as we move forward with larger scale production of our commercial prototypes. There is no assurance that we will be able to resolve the known technical issues. Future testing of our prototypes may reveal additional technical issues that are not currently recognized as obstacles. If we cannot improve the performance of our prototypes in a timely manner, we may be forced to redesign or delay the large scale production of commercial prototypes or possibly cause us to abandon our product development efforts altogether."
Sentiment: Strong Sell
sounds like this is the first time you've ever read a 10k from any technology development and/or start up company; pretty common language that is often used in this form or others very similar