And speaking Josh, to kind of some of the number questions you asked. When you look at the number of physician we've trained compared to our current install base, our install base at the end of the year. We've trained physicians representing more than 90% of our current lumivascular accounts. And so we took full advantage and Dr. Simpson challenged the organization to take advantage of that early clinical approval of Pantheris so that we can move this process forward. The training session that we executed with a couple of hours, the didactic training session followed by hands on Cadaver Lab. We did these in regional centers around the country so that we could make it easy for travel for the physicians and but there was a large degree of commitment for these individuals to join us for this training session. And the feedback was extraordinarily positive coming out of every session. So we think we've done a good job preparing at least kind of the lead position user in these accounts prior to the launch of Pantheris. As we grow our install base throughout the year of course there will be the opportunity to train physicians within each of those accounts, we put out a target of approximately 150 accounts by year end. But we also will look to continue to expand the usage within hospitals by training additional physicians. So we're not guiding to a specific number of trained physicians by the end of the year but it is something that we are focused on in addition to providing opportunities for advanced training and continued training of our current lumivascular physicians. One other thing that we did in the fourth quarter that I think was extremely useful and will help us through this launch period of Pantheris is we took several of our physician investigators, 12 of our physicians over to Europe where they could observe live cases with the commercial version of Pantheris and they were well prepared and have been very involved in these training sessions to service physician proctors for new lumivascular or those positions who aren't as familiar with atherectomy or image guided atherectomy which is brand new. So we will continue to make that investment, we have invested at the same time in training and continued training and improved training of our sales force and we’ve talked about that on past calls but everything we've been doing really over the last quarter has not only been about continuing to build the install base, driving experience with [indiscernible] but preparing for this day today, the launch of Pantheris.