Travel outside USA - Green card in process

[r123456]

Currently I am on L1-A visa and have a stamp valid until 2017 and my wife on L2 visa with stamp valid until 2017. We have our Green Card application in process. Can we travel out of country for a month without risking the Green Card process? We have not yet been called for fingerprints. Our notice date is mid July 2015 and Green card filing category is EB1.

I have already received EAD card and online approval of I-131. My wife has not yet received her I-131 approval. We are planning to travel on 1st Dec 2015.

Please guide us.

Thanks!