Yes, this would be more, Dan, because I have had the good and then misfortune of being in the advertising business most of my career. And, look, I think you saw a little bit in the Facebook results and other things, which is, it really doesn't affect Chegg much at all. It's not a particularly big part of our business. The reason it affected us in Q4 a little bit was because, as you know, there are laws changing, there's California laws that are changing and Google is changing the way it uses cookies and other things. And that started a little bit more in Q4 -- earlier in Q4 than we had anticipated. But it's fully through our guidance for 2020. So we don't expect any hiccups in that. But what it really means is that, targeted ads, the revenue per, whatever you want to call it, whether it's revenue per search, or whether revenue per unit shown, will not see increases in the near future until technology, sort of, invents its way around these new policies. And so, it's not a matter of volume. It's just a matter of what you're able to charge per annum. When you do programmatic advertising it's a bidded format and it comes from third parties. And because those cookies stuff is not available anymore, the value just goes down a little bit. And it just happened a quarter or so earlier than we expected, because the laws really didn't change until January 1. And so, if you're covering the industry, you should just be cognizant of the fact that advertising, other than the strongest players, has been and will continue to be under pressure. As it relates to Chegg, it's really almost insignificant and is assumed in all of our guidance.