Reflecting back on an 8-K from 4/27/18, Yates and Budman were given the option of buying future shares at a price of $0.87 - 4,500,000 to Yates and 300,000 to Budman.
They can exercise these future options:
one half when 1200 units have been installed or there is $45MM of revenue
second half with 2000 units installed or $75MM of revenue.
Not sure of which option (units or revenue) will be achieved first, but Yates will certainly not give up on acquiring another 4.5MM cheap shares.