Yes, it was binding. At the least it had locked the two together and they were not allowed to negotiate with other companies during that time. It allowed to two to do their Due Diligence in information that would not be available unless a contract of this sort was in place. It also limits them as to what they can say during that period.
Now they are free to do whatever they want with whomever they want. Don't expect any internal details because that is still considered insider knowledge and would be illegal to slip into the public. I have a feeling that the next 10Q will be a whopper IF they even bother to file one now.
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