Here it is:
Beginning in the 2017-18 offseason, any team that is over the luxury tax threshold and signs a Major League free agent that has rejected a qualifying offer will lose $1 million from their international signing pool in the following signing period. A team that is not over the luxury tax would only forfeit $500,000 of its signing pool in the subsequent period.
So once again, this has nothing to do with the number of times in a row you've exceeded the threshold.