the shelf is measured in dollars, not shares.
it was a $15m shelf.
That's a 1m shares of they go for $15/sh, or 150m shares if they do for a dime.
The shelf by itself does not give a measure of dilution until consumated, only then does one know how many shares it ended up being.
I don't keep much track these days, but I thought they drew $3.5m and perhaps with something like $2m in warrants (don't know how warrants factor into a shelf) ... call it $5m
At 50 cents against the $10m left Wave could print 20 million shares.
The above content is my opinion.