The link Mark Shore posted  http://climate.nasa.gov/news/2361/study-mass-gains-of-antarctic-ice-sheet-greater-than-losses/  is from a November 2015 article.  Mark casts doubt on these results. However, he does not tell us where in their published papers the researchers claim such the findings are in error.  What the researchers claim is that the findings conflict with prevailing consensus, not that they are in error.  

ICESat's laser ranging instrument collected data for a full five years.  and its finding's indeed pose a challenge to the prevailing consensus.  To quote, " NOTE: The findings reported here conflict with over a decade of other measurements, including previous NASA studies. ".   ICESat-1 results may indeed be off base, but then again, they may very well not be. 

These matters should be resolved some years down the road after the new ICEsat-2 satellite is launched in 2017.