Old Dough

I have a question on the use of old dough.  I read somewhere that we can freeze old dough,  which I did to mine, probably about 14 days old. Now I'm taking out to use to try out on my Polaine de Champagne again. 

I took out from my freezer and refridgerator to defrost, not counter top. It looks like the yeast is still active.  Am I doing this right? should I have just defrost it within a short period and use it?  The colour and smell still stays good.

I saw a discussion on refreshing the old dough.  Can I just use it as it is,  throw and mix into my dough or I should at least refresh it first?