If you scroll down to page 25 or thereabouts you can see Glaukos...

If you scroll down to page 25 or thereabouts you can see Glaukos March 18 figures for sales/costs

http://d18rn0p25nwr6d.cloudfront.net/CIK-0001192448/8252b98f-b4c9-41a3-802e-96731834437b.pdf

Note that sales growth was not the impressive quarter on quarter either

Also note the substantial selling, general and admin costs.  They have to throw a lot of  money at marketing to ramp up sales. These cost rose significantly yoy

Also note the massive gross profit margin. This is why the market has put such a big price on Glaukos, it is thinking, if they get sales traction they will generate huge cash flow. Question is how much it cost to get the sales

From memory the gross margin on itrack was pretty solid as well.