Right. He was paid out(or off if you'd like) to leave. Why else do you think he would have been given(I'm sure this is what he wanted) $2.3M severence, acceleration of all vested options AND hundreds of thousands of shares in more option grants? It is almost like what wasn't he given to leave? This is not a normal compensation for someone who chooses to cut and run to "pursue other interest." His "other interests" will be counting his many millions once a buy out gets announced. I'm sure for competative reasons, the buyer wants things kept confidential until it is actually announced.
What are his reporting requirements if he chooses to sell shares? How soon would we know?
In general, the SEC rule is that former insiders need to report only the sale of shares acquired while they were insiders that were held less than six months. Since few if any of JP’s shareholdings fit this description, we probably won't know what JP is doing with his shares.
I would suggest, however, that the trading volume in IDIX is too small for it to be practical for JP to unload a significant portion of his holdings on the open market.