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Operator
Good afternoon. My name is Ralph and I will be your conference operator today. At this time, I would like to welcome everyone to the Cadence fourth quarter 2020 earnings conference call. All lines have been placed on mute to prevent any background noise. After the speaker's remarks, there will be a question and answer session. If you would like to ask a question during this time, simply press star then the number one on your telephone keypad. Thank you. I would now like to turn the call over to Alan Lindstrom, Senior Group Director of Investor Relations for Cadence. Please go ahead.
Ralph
Thank you, Rob. I would like to welcome everyone to our fourth quarter 2020 earnings conference call. I am joined today by Lipu Tan, Chief Executive Officer, Anirudh Devgn, President, and John Wall, Senior Vice President and Chief Financial Officer. The webcast of this call is available through our website, cadence.com, and will be archived through March 19th, 2021. A copy of today's prepared remarks will also be available on our website at the conclusion of today's call. Please note that the discussion today will contain forward-looking statements and that actual results may differ materially from those expectations. For information on factors that could cause a difference in our results, please refer to our filings with the Securities and Exchange Commission. These include Cadence's most recent reports on Form 10-K and Form 10-Q including the company's future filings and the cautionary comments regarding forward-looking statements in the earnings press release we issued today. In addition to financial results prepared in accordance with generally accepted accounting principles, or GAAP, we will also present certain non-GAAP financial measures today. Cadence Management believes that in addition to using GAAP results in evaluating our business, It can also be useful to review results using certain non-GAAP financial measures. Investors and potential investors are encouraged to review the reconciliation of non-GAAP financial measures with their most direct comparable GAAP financial results. The reconciliations are available at the investor relations section of cadence.com. Copies of today's press release dated February 22, 2021, For the quarter and year-end of January 2, 2021, related financial tables and the CFO commentary are also available on our website. Note that again today we are conducting the earnings call from our respective remote locations. For the Q&A session today, we would like to ask you to observe a limit of one question and one follow-up. You may re-queue if you would like to ask additional questions and time permits. And now I will turn the call over to Lipu.
Rob
Good afternoon, everyone, and thank you for joining us today. In the year of unprecedented macro challenges, I'm pleased to report that Cadence achieved outstanding financial results for both the fourth quarter and 2020. For the year, we achieved 15% revenue growth and 35% on GAAP operating margin with strength across the board and all segments growing by double digits. In a moment, John will present more information for Q4 results and our 2021 outlook. The acceleration of digitization due to the pandemic coupled with exciting generational trends like 5G AI, ML, data analytics, and hyperscale computing continue to drive strong semiconductor demand. Leading hyperscaler mobile AI companies continue to aggressively pursue Moore's Law, while 5G wireless, industrial, and automotive verticals are leading the charge on the more than Moore's Fund. Our intelligent system design strategy triples our M, and our broad, compelling portfolio of chip, package, board, and system design solutions uniquely positions us to realize these exciting opportunities. In 2020, we accelerated our momentum and marquee accounts. while expanding our system portfolio through compelling acquisitions, enabling us to win new customers in our targeted vertical segments. Of particular note was the strength of our aerospace and defense business, as the digital transformation in this vertical continues. And we expanded and deepened our leadership chip with Northrop Grumman which includes the use of our custom analog and digital full flow. Additionally, we are especially excited by the momentum we have with the hyperscalers as they accelerate their chip and system design activity. Our engagements with the system companies have steadily deepened over the past few years, and revenue from system companies is now closer to 45% of our total revenue. It was a great year for our Cadence Cloud, which now has more than 175 customers. And we further strengthened our partnership with Cloud Infrastructure and Foundry Partners. Now let us review Q4 highlights. Design Excellence is a foundational layer of our strategy and includes our core EDA chip design platforms and IP portfolio. Our digital sign-off solutions offering superior quality of results and faster convergence continue proof rating at market shipping customers. We engage in well over 100 projects at 5 nanometer and below process technologies. And we are in earlier collaborations on the 2 nanometer nodes. Deployment of our full flow accelerated as more than 45 customers adopted our cadence digital full flow at the most advanced nodes during the year, including MediaTek, Samsung, Micron, Nuvia, and a global marquee customer. Based on the superior quality of results, a market-shaping hyperscaler significantly increased the usage of our digital solutions. Earlier in the year, a market-shaping automotive semiconductor customer committed to Cadence as its primary EDA vendor for digital design. Customers are faced with mounting challenges in system verification and software bring-up, and it's benefiting from our verification full-flow solutions that deliver industry-leading verification throughput. Momentum continued on Exilium, our digital simulator, with several competitive replacements underway, as well as expansions and new customer wins. Our hardware family of Palladium for emulation and Proteum for regression and earlier software development had a strong order to finish our best ever year for hardware. For the year, Palladium Z1 had 24 new customers and 34 expansions. Our Proteum had 13 new customers and 14 expansion. Iman was particularly strong at AI and hyperscaler customers. Ericsson renewed their commitment to cadence verification hardware, including both Palladium and Protium. A unique differentiator of the Protium X1 is the common front-end compiler with the Palladium Z1 that enabled significant faster bring-up. And about 40% of our hardware business during the year included both D1 and X1. Our IP business had a strong year as our focus strategy and a compelling portfolio leveraged on the ongoing IP outsourcing trend. We continue expanding the footprint of our leadership EDR and PCIe IP and have several design wins at the 5 nanometer and lower process nodes. High-speed SIRDI is a critical component of hyperscaler infrastructure. And several customers have adopted our 112 gig SIRDI IP, including Exide Labs, who has also demonstrated working silicon. Tensilica has strong loyalties and significant wins at the key-through wireless stereo and mobile application processor customers. Additionally, the automotive segment has a strong, ever-good momentum, which wins in functional safety, radar, and digital radio, including an ADAS win at leading self-driving car company. In system innovation, we are very excited about our system design and analysis segment, which had a particularly strong year with greater than 25% revenue growth. Rising system complexity for advanced 5G automotive and HPC applications is driving the needs for seamless platform solution across design, simulation, and analysis. AWR and Integrin deliver strong great results in 2020, and there is a strong customer interest in our integrated virtuoso, innovis, Allegro, and AWR microwave office solutions. with in-design analysis. In system analysis, we are executing to our strategy of building out our multi-physics portfolio, offering best-in-class solutions and delivering superior results compared to legacy industry solutions. Strong market adoption continue for our system analysis products. And we are particularly pleased with the growing number of repeat orders with customers, including ST microelectronics, Realtek, and a market-shipping hyperscaler. We triple our system analysis TAM by adding computational fluid dynamic CFD technology to the pending Numerica acquisition. which will bring leading CFD technology and deep domain expertise of Dr. Charles Hirsch and his team to Cadence. Numeca has over 450 customers, including NASA, Honda, and Ford, across multiple verticals, such as aerospace, automotive, industrial, and marine. For pervasive intelligence, we continue to incorporate machine learning technologies in various tools for improved PPA and faster convergence. Exilium ML has a successful engagement with several market-shaping customers, delivering up to a five-time improvement in regression throughput. We also progress. on providing IP specifically tuned for AI machine learning applications, especially edge-influencing applications. Cadence continues to invest in fostering innovation and advancing education through endowments at top universities. Building upon previous endowments at Stanford, the University of California at Berkeley, and Carnegie Mellon University. We announced a $5 million endowment at MIT's Schwarzman College of Computing to promote research in the fields of artificial intelligence, machine learning, and data analytics. Now I will turn it over to John to go over the Q4 results and present our 2021 outlook.
John
Thanks, Upu. Good afternoon, everyone. I'm pleased to report we exceeded all of our key operating metrics for the fourth quarter and fiscal year 2020. We achieved 50% on the Rule of 40 metric for the first time through a combination of 15% revenue growth and 35% non-GAAP operating margin. Consistent execution against our strategy and double digit growth across all product categories helped us achieve this landmark. But we also had the benefits of some tailwinds during a fiscal year, which included a 53rd week, a strong second half in China, and the recovery of $26 million that we previously thought to be uncollectible. The pandemic brought many challenges, and I'm very proud of our Cadence team for their compassion and resilience in the face of adversity. Their focus on innovation and customer success resulted in continued acceleration of Cadence's three-year revenue growth CAGR, which is now into double digits. Let's go through the key results for the fourth quarter and the year, starting with the P&L. Total revenue was $760 million for the quarter and $2.683 billion for the year. Non-GAAP operating margin was approximately 37% for the quarter and approximately 35% for the year. GAAP EPS was $0.62 for the quarter and $2.11 for the year, and non-GAAP EPS was $0.83 for the quarter and $2.80 for the year. Next, turning to the balance sheet and cash flow, Our cash balance was $928 million at year end, while the principal value of debt outstanding was $350 million. Operating cash flow in the fourth quarter was $136 million and $905 million for the full year. DSOs were 44 days, and we repurchased $380 million of Cadence shares during the year. Before I provide commentary for Q1 and fiscal 2021, I'd like to take a moment to share the assumptions embedded in our outlook. We expect strong revenue growth for the first half, followed by more muted second-half growth as we lap some tough second-half comps. Our outlook further assumes the pandemic restrictions will gradually ease across the globe this year, resulting in higher T&E expense in 2021 compared to 2020. We've included the expected impact of the pending NUMECA acquisition in our 2021 outlook, And finally, as usual, our outlook assumes that the export limitations that exist today for certain customers will remain in place for all of 2021. Embedding these assumptions into our outlook for fiscal 2021, we expect revenue in the range of $2.86 to $2.92 billion. Non-GAAP operating margin of 34.5 to 36%. Gap EPS in the range of $2.09 to $2.19. Non-gap EPS in the range of $2.95 to $3.05. Operating cash flow in the range of $900 to $950 million. And we expect to use approximately 50% of our free cash flow to repurchase Kaden shares in 2021. For Q1 2021, we expect revenue in the range of $710 to $730 million, non-GAAP operating margin of approximately 35%, GAAP EPS in the range of 55 to 59 cents, and non-GAAP EPS in the range of 72 to 76 cents. And we expect to repurchase $110 million of cadence shares in Q1. Our CFO commentary, which is available on our website, includes our outlook for additional items, as well as further analysis and gap-to-non-gap reconciliations. In conclusion, Cadence delivered another year of strong operating results, achieving 50% on the Rule of 40 metric for the very first time. We remain focused on driving profitable revenue growth, and at the bit point of our outlook for fiscal 2021, I'm pleased that we are on track to grow our annual revenue by over $1 billion since 2016, with more than 50 cents of every dollar of revenue growth dropping through to non-GAAP operating margin over that period. I would like to close by thanking our customers, partners, and our hardworking employees for all that they do, and I'd like to remind them all that their health and safety continue to be our first priority. And with that, operator, we'll now take questions.
Operator
At this time, I would like to remind everyone who wants to ask a question to please press star, then the number one on your telephone keypad now. As a reminder, we ask that you please limit yourself to one question and one follow-up. We'll pause for a moment to compile the Q&A roster. And your first question comes from a line of Gary Mobley from Wells Fargo Securities. Your line is open. Good afternoon, everybody. Thanks for taking my question. And let me extend my congratulations to a strong start to the fiscal year and a strong execution relative to your Rule 40, exceeding that by 10 percentage points. And that leads me to my question, John. Could you help us level set what that 35% operating margin in 2020 may have been if you didn't have you know, I guess the reversal of the bad debt reserve or bad collectible reserve, the fact that you weren't able to bring out employees at a fast enough rate and then as well the extra week, you know, how does that 35.25% operating margin guide fiscal year 21 compare to a level set fiscal year 20?
John
Thanks for the question, Gary. It's probably a multi-part question. I guess in terms of the collections, we had collections windfall of $26 million in the second half, most of which came in Q4. And some of those invoices were very old, which meant that $22 million of the $26 million was recognized in revenue before the end of the year. um but and that was in relation to if you recall in the middle of the year during the pandemic um uh we had some smaller customers that weren't able to pay us and we reserved for those um and we helped them out that uh our engineers and and uh team at cadence were determined to help them out whether they were paying us or not but uh some of those customers turned around and and um and managed to survive, and we weren't sure if they would. So that collections windfall kind of distorted maybe some of the revenue timing in the quarters during the year, but didn't really impact, that $26 million didn't really impact the year, because originally we had it in the year, then we took it out in the middle of the year, and then like that $22 million of that $26 million that got collected got recognized. In relation to the extra week, we thought that was going to be $45 million, and it was. But the extra week, of course, was a 2% tailwind in terms of helping us achieve 50% on the rule of 40 in 2020. And what was a 2% tailwind in 2020 is a 2% headwind now in 2021 when we go from a 53-week year to a 52-week year. And then I guess we had a really strong second half in China. I mean, when I step back from individual quarters and halves, I would say that our business is very strong in all regions and across all of the product categories. The three-year revenue categories... they're up to 11% now in 2020. And at the midpoint, it's 11% for 2020. At the midpoint of our outlook for 2021, that's at 11% too. So we're already off to a very strong start as well in the first half of 2021, but it's too early really to say if that's sustainable in the longer term. So the second half, we have kind of muted revenue guidance. When I looked at the second half of 2020 in China, What I noticed was that we had a higher than normal proportion of upfront revenue in our recurring revenue mix for the region and China. For our outlook in 2021, I've assumed we return to our usual recurring revenue mix in the region. And that, along with the fact that we won last week in the second half in 2021 versus the 2020, that's what contributes to the conservative revenue close outlook for the second half.
Operator
Okay. That's very, very helpful, John. I wanted to... ask you about the materiality of the software systems analysis product group, including NMECA. I guess there's perhaps various documentation that NMECA had, roughly $30 million in annual revenue. Is that a pretty good approximation? And for the overall systems analysis category, how material is this now? Is it somewhere in the ballpark of what, 1% or 2% of revenue now, and how much is it contributing to your overall growth? Thank you.
John
So, Gary, your system analysis business is doing great. My bookings and revenue grew strongly in 2020. The operating margin profile there is better than EDA, which allows us to invest in the business while we're generating strong incremental margins that improve our overall operating leverage. In relation to Numeca, when we issued the original press release, we highlighted that the impact to 21 is pretty immaterial. It's pending. We expect it to close. It's imminent in terms of the close. I would expect it to close this week. And as usual, of course, we'd expect purchase accounting rules to initially limit the revenue that we can recognize on New Mecca in the first year. So we expect that to be temporarily dilutive to earnings in 2021, and that's already embedded in our outlook. So from that perspective, we don't have anywhere near as much revenue in 2021 as you're expecting.
Operator
Appreciate it. Thanks. Your next question comes from a line of Mitch Steeves from RBC Capital Markets. Your line is open.
Mitchell
Hey, guys. Can you hear me? Yeah. Thank you. Okay. Yeah, so the first one is just on the 45% systems exposure now. I'm just sort of curious about why that's trending up so quickly. About three years ago, I think it was closer to like low 40s or 40%, which is kind of metric, but now we're suddenly at 45, and it sounds like that might even go higher. So maybe can you help us understand what exactly is going on with that business that's causing it to spike up? And then secondarily, regarding your 50% flow through in the operating margin, clearly that's what you've been doing, but is there any difference between the systems and semis onboarding in terms of profitability for you guys? Those are my two questions. Thank you.
Rob
Yeah, Mitch, maybe I can answer the first question first about the system company. And then we provide this end-to-end media portfolio. And also with our intelligent system design, we are moving up into the system analysis and area and also the packaging side. And then as you can tell, this generation wave in the 5G and also the hyperscale and then autonomous driving And really, the system company is starting to engage quite actively with us because we're providing a suite of solutions that we're looking for. So I think it's kind of an accumulation of the last 12 years, continue working on it. So we're delighted, you know, getting closer to the 45% of the revenue. And for them, clearly, the system, the packaging, you know, not just the silicon development is critical for them. and we can provide an integrated solution for them so that they can design a complex system that they're looking for. And so we are excited about this opportunity and our strategy, you know, investing and behind it. And so we are glad to see the performance.
John
Yeah, Mitchell, and to the second part of your question there, that, like you say, that, you know, there's a higher than normal – profitability i think for us in the system analysis business and it's been growing really fast for us i mean if i look at incremental margins i called out my prepared remarks this um you know where uh we're at the midpoint of our outlook uh for 2021 uh we're expecting our non-gap operating margin to grow by about 550 million over the five-year period from since 2016. uh and that's about 51 of the revenue growth if you uh if you calculate the revenue growth over that period of time And then, you know, when I compare the midpoint above for 21 against 19, I did the same exercise, and I got 51% again before the impact of Nubeqa. With Nubeqa, it kind of takes it just down under 50.
Mitchell
Okay, that's perfect. Just to clarify and make sure I understand this correctly, system analysis, it sounds to me, and maybe I'm reading this too much into this, you're seeing like a step function in your 3D clarity business. Or am I reading too much into this?
Rob
Well... More than that, I think we also have all these hyperscale guys and some of the system company service providers. They are quietly also building up their semiconductor custom silicon design. And so our entire suite from the design excellence, from the EDA, IT, and then plus our system analysis plus, acquisition we make in AWR and Integrin, they're providing a lot of system for the 5G and also the industrial group.
Mitchell
Very helpful. Very impressive quarter. Thank you. Thanks.
Operator
Your next question comes from the line of Pradeep Rahmani from UBS. Your line is open.
Rahmani
Hi. Thanks for taking my question. Congratulations on a great quarter and a very solid guide. I just had a couple of questions, maybe a last one and then have a follow-up. How are you thinking in terms of the mix you're seeing coming out of China versus the rest of the world? I mean, last quarter, it felt a little bit more towards IP and hardware, but it feels like your growth is now increasingly becoming more broad-based in China and driven by EDA and software as well. Is that a correct read?
Rob
Yeah, let me answer this just a little. So clearly, You know, APEC is a strong growth region for us. And then we've done well in China on Q3 and Q4. And then, as you know, China is heavily investing in semiconductor industry. So in some way, you know, we have a broad portfolio of EDA tool, IP, and even the system analysis and some of the packaging, and then the 3K packaging, and it becomes critical for them. And so I think overall, We support the customer globally, and then China is particularly strong, and we will continue to comply with all the export control requirements. But meanwhile, so far, up onward, we see strong momentum over there.
John
And Pradeep, I would add there that, like, if you step back from looking at any individual quarter or half and you look at the three-year CAGRs, I think our growth is accelerating across all regions in our outlook for 2021.
Rahmani
Great. And for my follow-up, you had a very strong year on IP. How do we think about the sustainability of growth in IP going forward, given, of course, there's longer-term drivers, but just coming off of such a strong year?
Rob
Yeah, so I think it's a good question. You know, IP tends to be lumpy. But so far, we like this IP outsourcing trend. And we have a strong portfolio in terms of DDR, CIE, and also the 30 is a must-have for the hyperscale. And also some of the Tensilica in terms of audio and also the automotive sector. So overall, we are delighted. Last year is a strong year. But as you know, it's a very lumpy upfront. And so we will continue to focus on that.
Operator
Thank you. Your next question comes from the line of Jason Salino from KeyBank Capital Markets. Your line is open. Again, your question comes from the line of Jason Salino. Your line is open. Sorry about that. Sorry, I was on mute. You know, the first question, the America acquisition, I know it's pending, but maybe can you speak to the, you know, what, is so attractive about that business. I know CFD is a pillar physics part of the market. And then, you know, make versus buy there. I mean, what factors went into acquiring versus, you know, just building in?
Rob
Anurag, do you want to take this one?
Needham
Yeah, definitely. Yeah, that's a good question. So, as you know, we are pretty excited about our move into system analysis, which is driven by our, you know, expertise in computation software. of numerical mathematical software. And we have a lot of expertise in that organically, as we saw in the development of Clarity, which is the 3DM solver that has been generating a lot of good results. And the second thing we are excited about is the customer synergy. A lot of customers, as we discussed, we have a lot more system companies, and they are asking for the system analysis capability. And then the question becomes whether to organically develop or to acquire. And, you know, we look at the space. And in terms of system analysis, CFD is a very critical area. It's one of the largest market segments with a lot of vertical application. And Numeca has very good technology with, you know, more than 450 customers. So we are pleased to welcome them to Cadence with this spending acquisition. And I think that can be used as a basis for to expand further, expand more in R&D with our computational software strength and expand more with our customer base. So we are very happy to use them with their expertise in CFD to expand into this very, very exciting area for us.
Operator
Okay. And then my quick follow up with this is I think you mentioned that it was a 3x10 you know, expansion with the acquisition in the CFD. Does that three-time expansion also include other physics, like structural, or is that just CFD alone? Thank you.
Needham
So in terms of system analysis, that's a pretty big segment, and it's about $6 billion, we estimate. And the other good thing about it is that it is growing rapidly. There is always more need for more and more simulations. What we estimate is clarity in Celsius is about $800 million in addressable market, which is EM and thermal. And CFD is about 1.6. So CFD triples our time from 800 to about 2.4.
Operator
Your next question comes from a line of Jason Ader from JP Morgan. Your line is open. Thanks, Jake, for my questions, guys. The first question is on the 175 cloud customers. What does that mix in terms of systems versus semiconductor companies look like?
Rob
Yeah, we don't have a breakdown on that. Clearly, we are very excited. You know, customer, you know, it's clearly our solution provides that flexibility and and also different use model, and either it's a cadence-managed. So overall, we're providing EDA software and Palladium platform. The most important is providing the productivity and scalability. So I think overall, we are excited about 175 customers. We didn't break down in terms of semiconductor or system company, but overall, both are strong for us.
Operator
Okay. And then, John, you mentioned that not expecting China to be as active in upfront revenue in 2021. So any particular reason, I mean, was it kind of politically driven why that particular geography had a bigger mix of hardware and IP in 2020? No, well, it's...
John
When we have more hardware in any one quarter, in any one region, you're going to have a higher mix of upfront revenue in that region, in that quarter. And we saw that with a strong Q3 in the functional verification space and a lot of that strength within China. And, you know, I was looking for signs of a pull-in in Q3 and to try and figure out was there some acceleration of purchasing that came out at 21 or did it come out at Q4 where people just preparing with the pandemic where they're just trying to get their hardware delivered earlier for fears of delays due to the pandemic. And then what we looked at, I was waiting for a view of the pipeline. Pipeline for 21 is very strong. And when I look at that and compared it to what had happened, what was different about the second half of 2020 for China, what I did notice is because of that hardware, that we had a higher mix of upfront revenue in the region in the second half than we would normally see. I'm not sure if that's sustainable. I mean, it looks like we're off to a strong start again in Q1. But for the purposes of, you know, determining an outlook for 2021, I assumed, I thought it was safest to assume a return to our usual recurring revenue mix, which could prove to be conservative for the second half. But... But I'd rather go out with outlook assuming that we return to the usual recurring revenue mix than assume that that growth that we saw in the second half of 2020 continues. I mean, if it does, when we have increased visibility into revenue in the second half, we can update our outlook at that time when we see it. But I just didn't want to go out with too strong a second half right now until I have a clearer visibility into the pipeline in the second half. Sure.
Operator
Okay, thank you. Your next question comes from a line of Joe Brewing from Baird. Your line is open.
Joe Brewing
Great. Hi, everyone. John, you've been referring to the tables in the release, and I'm interested in the one that breaks it down, three or Kager adjusted for the extra week by product group. If you think into 2021, and again, just adjusting for the week comparison, would you expect kind of similar dynamics between the product segments where IP and system design should remain kind of the fastest growers? Or are there any new developments at a product level to consider as 2021 goes on that might influence some of the trends you've seen?
John
Good question. I mean, we're not guiding by individual product category. But if you look at the three-year CAGR for 18, 19, and 20 on that table, you see they don't change dramatically year over year, particularly on the three-year CAGR view. But the ones you call out, IP and system design analysis, are kind of the smaller dollar values. But So they have the benefit of growing from smaller numbers. And in the past, we've seen those grow faster. But in relation to new products, I think the The amount of innovation that we've seen, the new product releases and preparation that we've seen from the R&D group, they haven't slowed down at all. If anything, they're accelerating in their new product development, even through the pandemic, which has been fantastic. But typically on an earnings release, we wouldn't announce any new products. You'll see those at CDN Lives, which probably start around late March, April time.
Joe Brewing
Okay, great. And then this next question might be product development related, but If I heard Anirudh correctly, systems design is maybe a $6 billion total opportunity. And given the solvers you've introduced or the new CFD being acquired, you're up to $2.4 billion. And so are there other categories or additional things that you have in mind that we can maybe expect you growing into over the next few years?
Needham
Yeah, that's a good point. And first of all, I want to highlight that we are building out this multi-physics platform. And CFD is a pretty big segment of that market. So we started with finite element and electromagnetics and then now go to CFD. And there's a lot of commonalities there. So I believe that itself presents a lot of opportunities to us, like we mentioned, tripling our addressable markets. Now, there might be more in the future. We always look for that. But at the same time, the current electromagnetics and CFD already has a large market segment that we're busy addressing. So the answer is, yes, if opportunities come, we will systematically expand. But already, that's a good opportunity for us.
Joe Brewing
OK. I'll leave it there. Thank you.
Operator
Your next question comes from the line of John Pitzer from Credit Suisse. Your line is open.
John Pitzer
Yeah, good afternoon, guys. Thanks for letting me ask questions. Congrats on the solid results. John, as you rightly pointed out in your preamble, if you adjust for the extra week and some of the unexpected revenue in 20, your initial guide for 21 is already embedding sort of double-digit growth and I know you said that it's too early to say if that's the new norm, but I guess I'm kind of curious, what are you looking at to be able to make that call that this might be the new normalized growth rate? And Libu, as you talk about potentially a double-digit secular growth rate, What do you think is driving that? Is that sort of specific to Cadence and your strategy? Do you think this is core EDA customers? Do you think it's the proliferation of customers into non-traditional areas like hyperscale systems and autos? If you can give us a little bit of help on that, it'd be appreciated.
John
So, John, I can take the first part of your question, and then I'll pass it over to Lipu. In relation to the strong first half guide and strong first quarter guide, most of our revenue is software, and most of it's recurring revenue. We expect recurring revenue to make up 85% to 90% of our revenue for the year. It's very, very predictable and very, very predictable certainly in the near term. Where I had some difficulty was projecting what upfront revenue might be out in Q3 and Q4. The outlook for the second half is more conservative than the first half. It's very, very predictable in terms of great visibility into the pipeline. We're off to a really strong start in Q1 already on the upfront business. And so much of that revenue is recurring in the first half. Yeah, we're seeing accelerating revenue growth. The challenge in the second half, of course, is we're lapping very tough comps against the second half of 2020. And I just don't have the visibility into the upfront pipeline for Q3 and Q4 yet.
Rob
Yeah, on the second question, let me describe. I think it's kind of exciting about this renaissance of semiconductors. with the five-generation waves happening at the same time, the AI, machine learning, you know, all about data, you know, data analytics, 5G, and then the cloud infrastructure had to change because, you know, all this massive data coming in, and then how do you address that network scaling, and then storage is aggregation. So it's a lot of changes to the infrastructure, and that's a lot of fueling, a lot of... design activity. So that's why we see a lot of design activity, not just from the semiconductor players, now the system player, and then the whole industry 4.0, they all move into AI machine learning, the digital transformation that drive a lot of semiconductors. So overall, the industry is moving in the right direction to us. And then meanwhile, I think clearly, Kaden, with the intelligent system design strategy, really tie in really well from the, you know, the design, excellent at providing the tool and IP. Now we move to the next level of system innovation. And I'm going to talk about the system analysis, you know, the CFD and the physics and the multi-physics model. Then the next thing is move up into the pervasive intelligence that, you know, using AI machine learning, data analytics, drive all the vertical industry that is, you know, major transformation going on. So I think we are well positioned to capture that opportunity.
John Pitzer
My second question is clearly when you look at China as a region, from Q4 of 19 to the back half of last year, it almost doubled as a percent of revenue. And, John, you clearly talked about potentially some one times that came in in the back half of the year that you're not embedding sort of in the guide for 21. I'm just kind of curious, as we think about currently China at about 17%, What's kind of core embedded as a percent of revenue when you're 21 guys realizing that that's subject to change? And if you think longer term with China's aspiration, is this about the right level as a percent of revenue? Or would you expect this on a secular basis to continue to grow over time?
John
Well, again, you know, individual quarters, I wouldn't focus too heavily on any one individual quarter or even half. I mean, it was a tremendous second half for us in China. 2020 was a strange year. I mean, with the pandemic, with the extra week in Q4. I mean, you'll see in Q3. We had a lot of strength in our functional verification group. In Q4, you'll see the software business has performed really, really well. Of course, it had the benefit of the extra week was a 14th week in your normal 13-week quarter. And we have one less week in the second half of 2021. But we're very, very pleased with the growth we're seeing in China. It looks like it's continuing on. We're seeing that strength continue on into Q1, the pipeline strong, seeing that in the first half. I just wanted to be conservative in the outlook for the second half until I have better visibility into second half up front revenue pipeline.
John
Thank you.
Operator
Our next question comes from the line of Tom Dibley from DA Davidson. Your line is open. Yes, good afternoon. Maybe first just a clarification for John. When you look at your expectations for 8% revenue growth and 8% OPEX growth and it's and the lack of leverage there, did you say that was primarily due to just the NMECA acquisition, the increased cost?
John
No, no, it's certainly not primarily due to the NMECA acquisition. I think, you know, in terms of expense growth, our headcount is up 8%. Our headcount increased about 8% during 2020. And we're investing heavily again in hiring in 2021. Your new mecca will come into the mix, we hope, through the second half of Q1 and then the remainder of the year from an expense perspective. We expect merit to hit. Merit increases will be July again, so that will be... You'll see a slight uptick there in expense in Q3 and Q4. And the growth in expenses through the year that would typically come from that is being offset by some more efficient infrastructure spend that we have planned as the year progresses. If you look at our 10K that we filed, you'll see that we initiated a restructuring plan in Q4 2020 to optimize our spend on infrastructure spending. And the expense mix in 2021, I think if you compare 21 versus 20, you'll probably see in 21 we're spending more on people and less on places than we were in 20. That's kind of driving some of the margin profile.
Operator
Okay, that's very helpful. And then follow-up for Lou. When you look at the cloud, you talked about 175 customers. What do you think the long-term adoption is for EDA with the cloud and Do you think some of your really large customers will move a majority to the cloud at some point? And if they do, what does that do to your cost structure?
Rob
Very good question. This is still a very early stage. We are very encouraged with 175 customers. And clearly, we want to make sure that our initial product, in terms of system analysis, we can be cloud-native because we start from scratch. And then some of the EDA tools, we have different stage of moving to cloud native. And then really the holy grail is basically drive the productivity efficiency for our customer. And then our partnership with the hyperscale partners and infrastructure partners and also the foundry partners are critical in this effort. And so right now we have across small, medium, large customer embracing on cloud. And truly, I think if you can imagine, you have unlimited usage of machine server at your exposure and then so that you can really drive the performance, the productivity significantly. So I think that is a trend. We're just in the beginning, early stage, but we are very encouraged with the customer support in order to continue to grow. Clearly, our partnership with the hyperscale partners and also the foundry partners are critical because of their PDK, all the different solutions they have. We want to make sure that we work with them together and support our customer and also addressing the needs of customers.
Operator
Okay, thank you. Thank you. Your next question comes from a line of Galminder from Berenberg Capital. Your line is open.
John
Hi, thanks for taking my question. The first one, I just wanted to follow up briefly on Numeca and more generally on your ambitions within the kind of mechanical simulation space. If you think about the convergence that's happening with Numeca now, you said you have a CFD, you have a finite element analysis as well. So how far do you think your portfolio is based on what you have to be able to take it where you want to be in R&D terms versus potentially doing more of those tuck-ins in the CAE space?
Needham
Yeah, that's a good question. Let me take that. This is Anirudh. So like I mentioned, this move is driven by three factors, strength and competition software. Our customers are asking for more and more system analysis, system design capabilities, like Libro mentioned, and the overall need for simulation. And I think we are still in the early innings, but we feel confident about this space, as demonstrated by our results in Clarity and other products. And CFD is a pretty important area. I mean, it's, I think, one of the biggest segments in system analysis and The good thing about CFD, it has a lot of vertical applications, you know, all the way from automotive, aero and defense, all the way to medical. So I think that's a pretty significant expansion of our platform. And we are happy with this progress. You know, we are patient and, you know, like John mentioned, this segment is profitable. So we will continue building across this. and, you know, keep providing the best solution to our customers.
John
All right. Thanks. Thank you. And then just as a follow-up, maybe just expanding a little bit on the growth drivers of the businesses. Lidgo, you mentioned, you know, there's more slow-paced growth at the leading-edge customers, and there's more than more, which is kind of the system side. Considering the investment you're making in the system side, can you just comment a little bit on the growth, how it maybe 2020, how it corresponded between the leading edge and the systems companies in terms of that contribution to get you, you know, whatever we want to say, you know, 15%, depending on which number we're looking at. Thank you.
Rob
That's a very good question. And so I think we are very well positioned to be able to do both. And then clearly, you know, the hyperscale, mobile, and they are driving a lot into the Moore's Law. And as I mentioned, we are very delighted. We have more than 100 projects on 5 nanometer and below process node development with our customers. And we have earlier collaborations on 2 nanometer process. So I think, you know, this is very advanced. And we are delighted and we are very honored to work with the marquee customers that are pushing the envelope, and we are really excited about that development. On the other hand, we are so well positioned in our custom mixed signal analog and packaging, and like the 5G wireless industrial group, they are really moving into this mixed signal, and clearly the most and more. And so we are very well positioned, and we doubled down with some of this AWS and then the integrated acquisition, driving some of the RF, microwave requirements, especially in the antenna side of some of these 5G integrations. And then we have really good solutions for that, and customers see the benefit of working with us. So I think we are very well positioned on both sides. That's why we highlight that. from our portfolio point of view, and both engines are really taking off. And we are very excited engaging with the best company to work with us.
John
That's great. Thank you so much.
Rob
Thank you.
Operator
Our next question comes from a line of Rich Valera from Needham. Your line is open. Thank you. Let me add my congratulations on the Rule of 50 last year. Question, I think it's for Anirudh on the system analysis go-to-market. I was wondering, have you been doing that through the standard sales channel? And do you have any overlay sales and or specialized applications for system? And how are you thinking about scaling up any kind of dedicated system resources as you scale up that business?
Needham
Yeah, thanks, Rich. That's a great question. And, you know, of course, one is developing great products, and the other is, you know, go to market or helping our customers deploy those products. And the second part is as important as the first part. And, you know, especially for the system business, there are multiple facets to this. You know, in the semiconductor business or the big, large system companies, you know, we operate mostly through a direct channel, okay? But if you remember, we also have our Allegro business, which is our packaging business. We do quite well in PCB and packaging with Allegro. And Allegro does have a, already we do have an indirect channel. And like Libu mentioned earlier, you know, cloud is important going forward. So for the system business, I envision three channels. We are building three channels. One is the direct channel, because a lot of the big companies and big system and semi-companies anyway want system tools, like you mentioned. And expanding our indirect channel, you know, like we have for Allegro, and expanding it to overall system design analysis. And then a SaaS channel, or cloud-based channel, especially for smaller companies that don't have a lot of data centers and are more attractive to use on the cloud. So as we go to the system design and analysis, You know, we do have to build out these three facets of our go-to-market, and we are working all of them in different stages. But the strength of a direct channel helps us with our big customers, and then indirect and SaaS can help us with some of the smaller long-tail customers. So that's a very important part of the overall go-to-market strategy.
John
Understood. And thanks for those details.
Operator
And then, John, follow up for you. You'd given a backlog reserve number last quarter of 58 million, which I think had come down from from 70 originally. I'm assuming that came down materially in the fourth quarter. Can you tell us where that is today?
John
Yes, of course, Rich. We had a collections windfall of $26 million in the second half. Out of that $70 million, I think the majority of the balance of the $70 million is lost. I mean, many of those customers have closed their doors. I think we're in single digits and millions in terms of the ones we're left tracking. That could potentially be recoverable. But right now, in my outlook, I'm assuming it's not recoverable. But you're talking maybe $9 million. 10 million left out of that 70 that could possibly be recovered. But like I say, right now, I'm assuming it doesn't get recovered. We recovered 26 of the other 60.
Operator
Got it. Okay. Thanks very much, John. Your final question comes from a line of Jay Freeshower from Griffin Securities. Your line is open.
Ralph
all right thank you um i'd like to direct both of my questions to uh to honor root um first um we've heard for years of course from the uh the eda companies of uh ongoing design activity among your customers that that's remained robust We've also heard of the general direction of design style or types from general purpose chips more to specialty kinds of designs. What we don't often hear about is how customers' design methodology may be evolving, and I'm wondering if there are any Issues that you might want to talk about regarding, for example, hierarchical versus flat, which has been a consideration for chip design now for two decades or more. Are there any new implications or issues for that as it might pertain to or affect any of your EDA tools or new technologies such as iSpatial or design space exploration? And then, relatedly, there were a number of questions this evening already regarding system analysis and your broader ambitions in computational software. One thing we see on the other side of engineering software, the world you're approaching towards, are unified data platforms and common platforms for data management and the like, which you don't really seem to have. You do have multiple stacks for your various functional areas. Could you talk about how you're thinking about unifying or moving to a more common platform of that kind?
Needham
Yes, Jay. These are great questions. First of all, we want to make sure that we have best-in-class products, right? So whether that's digital design or verification and system analysis so we always you know as you know this is technology business best product wins and at the same time have a you know unified platform to go with it and this is how we did digital implementation this is how we did verification so both parts are are important to have best-in-class products whether that's in finite element electromagnetics or or CFD. And then there are opportunities to combine them in a much more unified way, especially around data, like you mentioned. So I completely agree that the need for unification, but we also at the same time want to make sure first that the products are best in class. You want a unified team, but each player has to be a strong player. But there are a lot of opportunities for data platforms and analytics like Debru also mentioned earlier. Now, in terms of your first question of new methodologies, I mean, there are several things happening. If I have to pick, you know, one or two key things that are happening, what we see with the customers. So one big trend, which you probably already know, is this move to 3D IC. I think this is going to be significant for the next several years. And it just changed a lot of methodologies in our customer base. And this is multiple high-end digital chips or even analog RF chips on a package. And that, I think, is driving a lot of change, especially in the cloud, hyperscaler companies, all the way to consumer companies. And we do have historically a lot of strength in packaging with Allegro. Of course, we have a leadership platform at Advanced Node with Innovus. And then now the analysis tools with Clarity and Celsius, because thermal is a big thing for 3DIC. So I think this whole methodology of 3DIC integration is one significant change that we do see in the customer base. And we are very excited about that because I think Cadence is in a unique position because of historical strength in analog and packaging and digital and then new strength in system analysis. And hierarchical, you mentioned, I think that's always a big thing as things get bigger. And if you look at 3DIC, this is another way to do hierarchical, because if you have four chips on a package, you don't have to redesign all four of them. You know, this is reused at a much higher level. But I do think 3DIC is a significant trend that is going to happen, and we are well positioned for it. Thanks, Anurag.
Ralph
Thanks.
Operator
I will now turn the call over to Mr. Luc Boutin for some closing remarks.
Rob
Thank you all for joining us this afternoon. I'm very excited about the growing market opportunities and the business momentum going into 2021. Our intelligent system design strategy is playing out very nicely as we benefit from new opportunities in design excellence, system innovation, and pervasive intelligence and an expanded auto-addressable market. We excelled in the challenging year thanks to the deep partnership with our customers and our partners and the strong commitment of the outstanding Cadence team. And lastly, on behalf of all our employees and the board of directors, we give a heartfelt thanks to those on the front lines will continue to work tirelessly in their effort to put this pandemic behind us. Thank you all for joining us this afternoon.
Operator
Thank you for participating in today's Cadence third quarter 2020 earnings conference call. This concludes today's call. You may now disconnect.
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