Does any one have any idea what this is? It was part of the MNKD SEC filing:

Milestone Agreement

In connection with the Facility Agreement, on July 1, 2013 we also entered into a Milestone Rights Purchase Agreement (the "Milestone Agreement") with Deerfield Private Design Fund and Horizon Sant� FLML S�RL ("HS" and together with Deerfield Private Design Fund, the "Milestone Purchasers"), pursuant to which, in exchange for a payment of $18.9 million, we sold the Milestone Purchasers rights to receive payments of up to $90.0 million upon the occurrence of specified strategic and sales milestones, including the first commercial sale of an AFREZZA � product and the achievement of specified net sales figures. The milestone rights terminate if we exercise our right to prepay the Tranche 1 Notes. In addition, the milestone payments are subject to pro rata reduction in the event of certain funding failures by Deerfield under the Facility Agreement.