As usual the 10q wording is ambiguous, but I don't think "15% of the available shares at present" is synonymous with 15% of the company. I interpret it to mean 15% of the remaining shares in the current shelf. However much that may be. IMO.
Following the discussions with investors, on November 19, 2017 the Company’s Board approved a new plan for equity awards of fifteen percent of the authorized shares at present,to take account of employee and director performance over the last approximately 6 years and anticipated performance over the next approximately 2 years. The awards are subject to various vesting provisions, forfeiture and acceleration provisions tied to milestones over the next 2 years. The Company is now undertaking the steps for implementation.
Most recent 10q pg. 28.