Looks like the he got off relatively light:
Now, the court-martial is over, and the results are somewhat surprising. Most thought the judge, Col. Glen Hines, would throw the book at him, as covering for the failures of military leadership has become a common occurrence. Yet, Scheller was given a fairly light sentence, which included a letter of reprimand and a forfeiture of $5,000 pay over the course of a single month. Further, the judge blasted command for the pre-trial detention and for leaking records to try to make the defendant look bad.
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Scheller will now be honorably discharged and enter into civilian life, which was apparently his goal anyway, given his disgust with command.
Marine Who Was Imprisoned for Speaking Against Afghanistan Incompetence Receives Surprise Sentence – RedState
I did think throwing him in the brig was somewhat over the top.