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Intrinsic Value is all-important and is the only logical way to evaluate the relative attractiveness of investments and businesses.
Ladies and gentlemen, thank you for standing by and welcome to Altair Engineering Incorporated Fourth Quarter 2020 Earnings Conference Call. At this time, all participants are in a listen-only mode. After the speaker's presentation, there will be a question-and-answer session. [Operator Instructions] Please be advised that today's conference is being recorded. [Operator Instructions]
I would like to hand the conference over to our Chief Financial Officer, Howard Morof.
Good morning. Welcome and thank you for attending Altair's earnings conference call for the fourth quarter of 2020. I'm Howard Morof, Chief Financial Officer of Altair. And with me on the call is Jim Scapa, our Founder, Chairman and CEO; and Matt Brown, who assumes the CFO role on March 16.
After market close yesterday, we issued a press release with details regarding our fourth quarter performance and guidance for Q1 and the full year 2021, which can be accessed on the Investor Relations section of our website at investor.altair.com. This call is being recorded and a replay will be available on the IR section of our website following the conclusion of this call.
During today's call, we will make statements related to our business that may be considered forward-looking under federal securities laws. These statements reflect our views only as of today, and should not be considered representative of our views as of any subsequent date. We disclaim any obligation to update any forward-looking statements or outlook.
These statements are subject to a variety of risks and uncertainties that could cause actual results to differ materially from our expectations. These risks are summarized in the press release that we issued yesterday. For a further discussion of the material risks and other important factors that could affect our actual results, please refer to those contained in our quarterly and annual reports filed with the SEC as well as other documents that we have filed or may file from time to time.
During the course of today's call, we will refer to certain non-GAAP financial measures. A reconciliation of GAAP to non-GAAP measures is included in our press release.
Finally, at times in our prepared comments or responses to your questions, we may offer metrics that are incremental to our usual presentation, to provide greater insight into the dynamics of our business or our quarterly results. Please be advised that we may or may not continue to provide this additional detail in the future.
With that, let me turn the call over to Jim for his prepared remarks. Jim?
Thank you, Howard, and welcome to everyone on the call.
Altair had an excellent fourth quarter and full year 2020, especially given the global COVID-19 pandemic and economic uncertainty. I am proud of what our team accomplished in 2020. In a year of business disruptions and personal challenges, Altair brought to market broad and deep additions and enhancements to our product portfolio, while delivering solid financial results.
Though some challenges remain due to the pandemic, 2020 has positioned us well for 2021. As we demonstrate successes around our vision for the convergence of simulation, high performance computing and artificial intelligence, we will continue supporting our customers with industry-leading technology and un-paralleled engineering and data science expertise.
We have never been in such an energized position regarding our software offerings. Our integrated suite of software optimizes design performance across multiple disciplines, encompassing structures, motion, fluids, thermal management, electromagnetics, system modeling and embedded systems, while also providing AI solutions and true-to-live visualization and rendering.
Our HPC solutions maximize the efficient utilization of complex compute resources and streamline the workflow management of compute intensive tasks for applications including AI modeling and simulation, and visualization. Our data analytics and AI products include data preparation, data science and visualization solutions that fuel engineering, scientific and business decisions.
We are pleased to report Q4 results with total revenue of $133.4 million. Software product revenue for the quarter was $113.6 million, reflecting year-on-year growth of 12%. Adjusted EBITDA was $21.7 million, an increase of 70% on the fourth quarter of 2019. All were well above our guidance ranges.
For the year 2020, software product revenue grew to $391.7 million from $366.7 million for prior year, an increase of 7%. Total revenue equals $469.9 million, compared to $458.9 million, a small increase, recognizing a continued softness in services.
Software product revenue is 85.2% of total revenue for the fourth quarter compared to 81.7%. In the prior-year period, for the full year 2020, software product revenue increased to 83.4% of our total revenue from 79.9% in 2019.
Our recurring software license rate was 92% for the full year 2020 versus 87% in 2019. Software renewals in the quarter continued to come in as expected, with several significant expansions and new customer activity remained healthy.
As we drive the convergence of simulation, HPC and AI into 2021, I feel it might be helpful if this quarter's customer stories focused on momentum toward this convergence. Panopticon, our solution for real-time data streaming and visualization was selected by a European company specializing in retail customer behavior analysis.
Their work includes biometric measures, which can in turn lead to predictions around buying preferences. The application supports a multi-format dashboard with data visualization, photos, video and audio.
Technical domain knowledge is key in the effective implementation of AI toward engineering applications. A defense agency is implementing a great example of AI converge with system modeling to support work including radio signals, satellite communications and electromagnetic spectrum performance.
Our work with them started a year ago around electromagnetic simulation; as we help them develop a cloud-based real-time telemetry data processing, data analytics and archiving system; it will include elements of data acquisition, real-time data science and visualization, simulation models in a closed loop and predictive analytics.
In the food industry, a large multinational company has been a longtime user of Monarch data preparation tools licensed on a traditional named user basis. After an M&A event, we met with the new parent company and opens conversations around Altair Units licensing model, especially with regard to the ability of the enterprise to access all of Altair's tools, including data preparation, data science and AI, as well as real-time data streaming and visualization.
This dialogue turns into a true win-win, with the customer now accessing the entire suite of our data analytics and AI tools across many additional users while seeing value and a substantially increased financial commitment.
In a similar fashion, a large financial services organization has been using Monarch for data preparation for more than 20 years. The relationship has been completely restructured from named users on a single application, licensing to a broad deployment of Altair Units for all of their data analytics and AI needs.
The result is significantly more users and nice growth in the relationship. We believe the Altair units licensing model has potential for disruption in the data analytics and AI market software marketplace.
A global leader in agricultural machinery committed to Altair units for the application of AI to engineering with a goal of using digital twins to improve predictive maintenance and reduce the time and cost required for testing. A European manufacturer of metal parts for the automotive industry is using Altair's AI and engineering capabilities to diagnose, predict and reduce production anomalies. These wins are great examples of Altair's deep engineering knowledge, helping customers to bring the power of AI to their enterprises.
One of our larger data analytics deals to close out 2020 a major technology company inked a 7-figure purchase agreement with initial use cases around payroll optimization. Along with the matching and reconciliation process, the customer will be using Altair for visualization and scoring analysis. Their internal ROI calculations on this implementation are impressive.
And we are delighted to see a customer so emphatic about their ability to get an outstanding financial return on our data analytics and AI tools. A great example of our vision of converging AI with engineering, as expressed in the press release, we issued last month discussing our MoU with Rolls-Royce Germany to collaboratively connect artificial intelligence and engineering to derive business value across Rolls-Royce's engineering, testing and design of aerospace engines.
The collaboration will address a wide variety of use cases, including applying data science for the vast amounts of engineering testing data, which can lead to a significantly reduced number of sensors needed. The single use case alone, have the potential to reduce recurring costs by millions of euros. As a pioneer of the convergence of AI and engineering, Altair is honored to be the technology partner of choice to help Rolls-Royce Germany, make better daily data driven decisions and transform their business and products.
On the topic of acquisition, I am pleased to announce we have acquired Flow Simulator from GE Aviation. Flow Simulator is an integrated flow, heat transfer and combustion design software, which enables mixed fidelity simulations to optimize machine and systems design. As organizations are increasingly simulating complex duty cycles, solutions like Flow Simulator are needed to model an entire system including rapid iteration concept modeling, understanding of system simulation and system behavior, and virtually anything that encompasses thermal management.
Bringing Flow Simulator to the Altair's software set will allow us to expand its capabilities in the aerospace market and make it available to new industries, including defense, renewable energy, automotive, and electro mobility. In addition to the acquisition, Altair and GE Aviation have signed a MoU to facilitate a higher level of collaboration and establish a long-term strategic partnership. I'm thrilled to strengthen our relationship with GE Aviation, a longtime customer and equally excited about the future of Flow Simulator, as we will bring the simplification of modeling complex thermal systems to new industries.
We continue to evolve Altair's organization and processes toward more operational efficiency, and believe these changes are resulting in more effective delivery of technology and expertise to our customers. One example is with our global technical support organization. Infrastructure and organizational changes are allowing us to provide deep knowledge and expertise to customers regardless of geography, even as our technology portfolio expands in broad. In addition to leveraging global capabilities for customer facing roles, we continue a path of internal digital transformation.
In 2020, Altair like many companies navigating COVID-19, shifted to a remote model for work and communications with customers and co-workers. Going forward, we expect to return to a hybrid model, remote work and traditional office and travel. We believe these changes while not affecting our external relationships will play a role for EBITDA expansion, as we scale revenue.
As announced in a December press release, Howard Morof is in the process of transitioning CFO role to Matt Brown. I am deeply grateful to Howard for his many years of great leadership and guidance for Altair, especially as we made the transition from a privately held company of many decades to an organization ready for an IPO, then to an operating public company.
In the 3 years since we went public, Howard has been a straight and steady voice for Altair. And I wish him well in his next adventures, especially those involving his family, and his work with charitable organizations. And choose our next CFO, it was important to me that we have someone with an operational focus and enthusiasm for doing the right things as we grow the company to the next level of revenue and profitability.
Matt is clearly on target in this regard, given his financial expertise, and large scale software company experience. Matt will officially take over from Howard on March 16. And both of them are to be congratulated on their superb process of transitioning the role in a way that has truly benefited the Altair organization. I look forward to working with Matt as we remain focused on delivering great technology to our customers, while we scale our software revenues and increase EBITDA for sustainable long-term growth.
Now I will turn the call over to Howard and Matt to provide more details on our financial performance and our guidance for the first quarter and full year 2021. Howard and Matt?
Thanks, Jim. I appreciate the kind words and I'm delighted to have contributed to the growth and success of Altair over the course of the past decade. I will cover our Q4 and full year 2020 results, while Matt will detail our expectations for 2021. As Jim mentioned, we delivered excellent fourth quarter results on the top and bottom lines driven by software product revenue, well in excess of our expectations going into the quarter.
I would like to remind everyone that our seasonal billings patterns coupled with the treatment of revenue under ASC 606 results in heightened seasonality in revenue and associated metrics with higher software product revenue recorded in our first and fourth quarters of any given year and we expect this pattern to continue. We exceeded our revenue guidance for Q4 driven by strong growth in software product revenue and handily exceeded our adjusted EBITDA guidance driven by the combination of strong software revenue performance in continued controls over our operating expenses.
We entered the quarter with a conservative perspective due to the uncertainties arising from COVID-19. Since our Q4 typically includes a greater proportion of expansion in new revenue compared to other quarters. We are delighted to see that the strong software growth we generated in Q3 carry through to Q4. We previously noted that changes in certain currencies can have an impact on our revenue, expenses and cash flows, especially when those changes occur over relatively shorter time periods, or when currency changes are more pronounced over time.
Accordingly, we believe it is meaningful to measure aspects of our performance on a constant currency basis. For 2020, currencies did have a positive impact of $3.8 million on billings in an insignificant impact on revenue and adjusted EBITDA for the year. For Q4 currency positively impacted revenue by $3.2 million and had a nominally positive impact on adjusted EBITDA. Billings benefited in the quarter by $7.5 million due to currency moves compared to Q4 2019, primarily driven by moves in the euro.
Our fourth quarter results are attributed to continuing solid demand for our software products that exceeded our expectations. Software product revenue reached $113.6 million, an increase of 12.3% from a year ago, and over 9% on a constant currency basis, while total revenue equaled $133.4 million, representing growth of almost 8% from the fourth quarter of 2019 and over 5% on a constant currency basis. Acquisitions did not have a meaningful impact on revenue for the quarter.
Total revenue continued to be impacted by the reduction in software related and client engineering services revenue resulting from the continuing impact of COVID-19 on the demand for these services. Reflecting continued modest recovery compared to Q3, our software related services revenue declined about 12% in the quarter relative to the prior year. These results represent improvement compared to Q3, which declined 22% compared to the prior year.
As expected, our client engineering services revenue declined by 15% in the quarter, compared to the prior year due to reductions in post by some of our CES customers, consistent with the prior quarter. Our 2020 results benefited from demand for our software products. Software product revenue reached $391.7 million, an increase of almost 7% from a year ago, while total revenue equaled $469.9 million, representing growth of 2.4% from 2019. Both exceeding guidance provided last quarter.
Software related services declined by 23.5% compared to a year ago, primarily impacted by the headwinds in our automotive customer base. Our growth and investment strategies remain targeted and higher margin software product revenue opportunities. Revenue mix continued its favorable trend in the fourth quarter, software product revenue increased to 85.1% of total revenue, up almost 350 basis points from 81.7% last year, without any adjustment for currency or acquisition related impacts which were minimal. This continues the important long-term trend of an increasing mix of software product revenue, the key driver to expansion of our operating margins.
For the full year, software product revenue progressed to 83.4% of our total revenue from 79.9% for the prior year. Our recurring software license rate that is the percentage of software product revenue that is recurring continues to be strong with a healthy increase to 92% for the year, as we continue to emphasize growth and our recurring revenue streams.
Fourth quarter billings were $146 million, an increase of 12% from a year ago driven by software momentum, indicative of the strong growth in our software product business. For the year, billings were $480.4 million, an increase of about 1% from a year ago, driven by the growth in our software product business offset in part by declines and software related and client engineering services. We tend to view billings over longer time periods due to the impact variations in timing of renewals, expansions, and new customer arrangements can have quarter-to-quarter.
I would like to shift to the balance of the P&L results. Gross margin in the fourth quarter improved to 75.5% consistent with the revenue mix shift to software product revenue. On a full year basis, gross margin improved by over 300 basis points to 74.2% compared to prior year gross margin driven by the positive shift in revenue mix. For the quarter, non-GAAP operating expenses, which exclude stock-based compensation, amortization of intangible assets and other operating income were at $81.9 million, an increase from $73 million in Q3 is consistent with our expectations of the impact of our acquisitions later in 2020 as well as restoring certain cost reduction efforts undertaken earlier in the year.
Adjusted EBITDA for the quarter equaled $21.7 million, a terrific increase of over 70% from last year, driven predominantly by the increase in software product revenue, along with the benefit of reduced travel and selling expenses operating under COVID-19 restrictions. In Q4, we did realize some revenue and incurred expenses related to the acquisitions of Univa, Ellexus and M-Base. The magnitude of these inclusions did not significantly impact our results, either on the top line or bottom line.
Adjusted EBITDA for the year grew over 45% to $57.3 million compared to adjusted EBITDA of $39.5 million a year ago, driven by healthy software momentum in the second half of the year, along with cost reductions over part of 2020 arising from COVID-19 actions we have spoken about previously. Our performance in 2020 pushed adjusted EBITDA margins in 2020 to 12.2%, up from 8.6% in 2019.
Turning to our balance sheet, consistent with the typical seasonality in our billings and collections activities, we ended the fourth quarter with $241 million in cash and cash equivalents. We had $120 million in undrawn capacity on our U.S. revolver. Just note that in early January 2021, we repaid the $30 million we had drawn on a line of credit during 2020. We generated cash flow from operations for the year of $32.9 million, compared to $31.4 million for 2019. Our free cash flow improved to $26.8 million, compared to $21.7 million for the prior year, due in part to reduction in cash expenditures for property and equipment.
It has been a pleasure to have been a part of Altair the past decade working with Jim, the entire Altair team, and more recently, the investment community. Having spent much time with Matt during our transition, I am completely confident that the finance function will be in great hands going forward.
I would now like to turn the call over to Matt to discuss expectations for 2021. Matt?
Thank you, Howard. I want to start by thanking Howard for providing a very thorough seamless transition over these past 2 months. When I started on January 4, I could not have imagined a better handover of CFO responsibilities. He's left us in a great spot for the future.
And he's assured me that if we need to call him, he'll still pick up the phone. So, Howard, thank you. I very much appreciate it.
As you just heard, we're coming off a very successful fiscal year 2020, and especially Q4, in what was a challenging COVID-19 environment. We saw record software product revenue in Q4 and for the full year with fiscal 2020 software product revenue growing 6.8% year-over-year. Total revenue in 2020 grew 2.4% year-over-year.
And while also a record high, we saw declines in our service revenue that partially offset the software product revenue growth, as some customers pulled back on their services and contract spend. As we look ahead to Q1 and fiscal year 2021, we expect to continue the momentum we saw at the end of 2020 and carry that into 2021 and are expecting software product revenue for Q1 2021 in the range of $118 million to $120 million or year-over-year growth of 8.8% to 10.7%; and for fiscal year 2021, in the range of $423 million to $431 million or a year-over-year growth of 8.0% to 10.0%.
In looking at total revenue for 2021, we believe our services revenue has stabilized. And although we do not expect to see service revenue declines in 2021, like we did in 2020, we are not expecting service revenue growth either, as we continue into what is likely another mixed COVID-19 year.
As a result, we are forecasting total revenue for Q1 2021 in the range of $138 million to $140 million or a year-over-year growth of 5.0% to 6.5%; and for fiscal year 2021, in the range of $502 million to $510 million, or year-over-year growth of 6.8% to 8.5%.
We believe our revenue guidance is balanced, but will depend on the levels and speed of the post-COVID recovery, particularly in the later part of the year. From a cost perspective, the company succeeded in limiting expenditures during 2020, while in the midst of COVID-19 uncertainty.
In particular, during 2020, we reduced marketing and tradeshow costs by almost 40%, relative to the prior year and reduced travel and entertainment costs by 68%. In 2021, we expect some of this activity to return to normal, resulting in an increase in costs year-over-year, particularly in Q2 through Q4 2021.
As we anniversary some of those cost cuts, and as travel resumes. However, we will continue to be disciplined in our expenditures. We are currently looking at targeted reductions in employee costs, contractor costs, and professional services spend as we reorganize within the business.
We expect these reductions to be substantially complete in the first half of 2021, freeing up capacity for investments in our product technology and sales capacity. As a result, we expect to incur cash reorganization costs in the first half of between $5 million to $7 million, which is excluded from our adjusted EBITDA.
For Q1 2021, we expect adjusted EBITDA in the range of $24 million to $26 million or year-over-year growth of 10.7% to 20.0%, which translates to adjusted EBITDA margin of 17.4% to 18.6%. And for fiscal year 2021, we expect adjusted EBITDA in the range of $58 million to $66 million or year-over-year growth of 1.2% to 15.2%, which translates to adjusted EBITDA margin of 11.6% to 12.9%.
Our expectations on adjusted EBITDA are inclusive of the cost reductions and investments I mentioned a moment ago. We expect free cash flow for the year to increase in line with the increase in adjusted EBITDA and will be impacted by the reduction related cash costs and are forecasting free cash flow for fiscal year 2021 in the range of $26 million to $34 million.
As a reminder, our cash flow expectations are sensitive to billings and collection patterns, which fluctuate seasonally. We've provided detailed guidance tables in our earnings press release, which was issued after close of market yesterday and includes guidance on non-GAAP net income.
Moving forward, when measuring non-GAAP net income, we will exclude non-cash interest expense and will apply a consistent non-GAAP income tax rate. We've made these changes to reflect management's view of the business and to be more consistent with our peers. These changes will be applied to comparable prior periods to aid in comparability and have been provided in the supplemental tables in our earnings press release.
COVID-19 developments continue to evolve. But we are cautiously optimistic on a broad economic recovery as we look ahead to 2021. Altair has never been better positioned to support our customers on solving some of the most challenging problems faced by engineers, scientists, and data analysts.
Our simulation products are being increasingly adopted earlier in the design process, improving product performance and reducing costs for our customers. Our HPC products are enabling customers to maximize their compute resources. And our data science and preparation tools are leveraging AI to enable customers to organize and visualize data to make important decisions quickly. We see these solutions converging and providing real value to our customers.
With that, we'd be happy to take your questions. Operator?
Thank you. [Operator Instructions] Our first question comes from Rich Valera with Needham. Your question, please.
Thank you. Good morning and congratulations on a strong finish to the year. And, Howard, best wishes on your next chapter and welcome, Matt.
And with that, I wanted to just talk about how the quarter played out versus your expectations, really nice upside in the quarter. And I'm wondering, was that a result of things coming in? Have you actually seen improvements during the quarter or just conservatism get embedded into the guidance, because you were kind of concerned about a COVID second wave, which I think you'd mentioned on last quarter's call? Just wondering where that upside came from on the quarter relative to your expectations.
So, Rich, we're on different places.
Jim, go ahead or I'm happy to answer.
Yeah, why don't you answer that, Howard, that'd be great?
Sure. Sure, so, Richard, and thank you for the nice words. We certainly entered with a sense of conservatism as we've, frankly, been pretty cautious over the course of the entire year, for obvious reasons, for most of 2020, for obvious reasons. So we entered the quarter conservative.
We know that in Q4 we have a little higher proportion of new and expansion revenue, as is typical in our Q4. So the conservatism that we saw was very well warranted. Against that backdrop, the quarter continued to, I would say, improve as the quarter navigated along, reflecting growth investments, strength in our customer base, and frankly, continued use and growth in adoption of technologies that are ever so critical to our customers.
So I think it was really a sort of a combination of conservatism, and as well, new and expansion in the way that you would hope to see.
That's great. And then, maybe, for you, Jim, great to hear about your success selling kind of converged analytics and simulation solutions. I just want to get your sense of where you are in that path towards creating that converged model, kind of relative to maybe where you thought you were going to be, when you made the acquisition and where you think it could be, say, 5 years from now, what you've done so far, and maybe what you're doing to further that integration? And then, just where you are in sort of the model transition for that analytics business? Thanks, Jim.
Okay. Thanks, Rich, nice to hear your voice. So, I mean, I think that the model transition is largely done at this point. We've really moved things over to subscription pretty well at this point and where it's kind of on par with the rest of [indiscernible] this year. So that part is done.
As far as sort of this convergence between the engineering and the data analytics, I think it's a very natural transformation that's really happening. It's happening within our products, and in ways that customers and users don't even know it's happening to some extent. And it's also happening for customers who really are beginning to recognize the opportunity.
So we have, almost every one of our account managers has opportunities at this point that are really taking advantage of this convergence. And it's really starting to engage. We're starting to understand use cases that make sense, as we have success and point those use cases to other customers. So 5 years from now, I don't think we're going to be talking about sort of a difference between simulation and AI. I think it's all going to be computational science, basically that we're talking about.
That's great. Thanks for that, Jim, and congrats again on a nice performance.
Thank you.
Our next question comes from Jackson Ader with J.P. Morgan. Your question, please.
Great. Good morning, guys. And, yeah, I'll echo Rich's thoughts. Howard, it's been a lot of fun. And welcome, Matt.
First question on the reorganization, what areas of the sales force or, I guess, what types of sales investments will you guys be making? Where are you going to be shifting chips away from and being placing bets?
Sure.
Yeah, Jackson, thanks for the question. Jim, you want to take a stab at that and then pass it to me?
Yeah, yeah, I think I should answer that question. Sorry, Matt. So in terms of where we're continuing to invest, we are continuing to invest in enterprise level customers who we see large opportunities with, so we're beginning to target our direct account managers more and more those opportunities and create more focus for them.
We're creating swim lanes really in the market. And working - the direct account managers have the accounts that make sense for these enterprise opportunities. We have inside sales and business development, working more down market and indirect also down market in combination with them. So we're continuing to make investments. We're just - we think we're just getting smarter at how we're organizing and leveraging the sales resources and the capacity that we have.
Matt, can you answer something there. I'm not sure what he's going to…
Yeah, I mean, I would just chime in and say, from a high-level context, right, I mean, this is - over the past 5 years, we've done 23 or so acquisitions. And continue to really refine our operating model. And so, that's how I would characterize this. We're going to continue to invest in our product technology and in our sales engine moving forward. And so, this is really a refocusing is the way that I would characterize it.
Okay. And then a follow-up, I guess, directly from that. What's the FX tailwind in 2021 for the revenue growth guidance?
It's a couple of points. I think we are - obviously, as we guide 2021, we're using today's rates on the FX, so you're not - we're not anticipating movement in the FX rates. But within the comparable to the sort of year-over-year impact, it's worth a couple of points of FX on the revenue line, but next to nothing on EBITDA, those naturally offset.
Sure. All right, great. Thank you.
Our next question comes from Bhavan Suri with William Blair. Your question, please.
Great. Thanks for taking my question and I'll echo my congrats in the quarter. Welcome, Matt. And, Howard, we will miss you. I'm sure we'll run into each other again, but best of luck. I guess, I want to touch on a couple of quick things.
One - maybe this one is for Jim. Jim, the services business naturally, obviously, this year or in 2020 had challenges, just COVID, et cetera. But as you think about it, one of the great things about that business was you got really intimate with customers, like you got to understand what they were doing, what they wanted.
It drove some product development or at least ideas around innovation. And as you think about 2021 and 2022, do you think you reinvest in that business a little bit to sort of keep that customer intimacy to keep those guys at the customers to help them with their solutions, but also to help guide and drive product innovation? How should we think about that playing out?
We are still very, very actively engaged with a lot of customers, I'll say, very advanced projects, in electric motors, batteries, those kinds of things, additive manufacturing, simulation, all of that. The service business that declined, if you will, last year, is closer to - it's a continuum of super advanced stuff that we do, down to a more commodity level. And we don't do the very commodity anymore over the last 5 or 10 years. But still that are getting lost, if you will or more of the things on the commodity level side. So we're still very engaged with customers, customers still recognize the technical superiority of Altair. And, it's advancing our products still, but it's also advancing these relationships.
Got it. Got it. And then maybe one for Howard and Matt combined maybe, but you haven't had that philosophy over the x number of years about guidance with Jim and team. And I guess, Matt, as you look at the guidance for 2021, given there is still risk in COVID. And you think about sort of billings was up 1% or a little above that in constant currency. I guess, what are you seeing in pipeline or our customers in the auto space hiring more engineers?
Are you seeing closed rates improve, lands improve, the size of the initial land improve, expand improve, that sort of gives you that visibility confidence? Again, the business itself is not choppy, but the customer adoption, customer buying behavior can be choppy. So just trying to understand, how you guys have thought about the guidance and sort of what you bring to the table in terms of visibility, I'd love to sort of think about that both tactically for 2021 in the strategic, how do you think about guidance? Thank you.
Yeah, yeah. No, I appreciate the question. So I would say that we are cautiously optimistic about 2021. And you can kind of separate top-line at least into the 2 sections: one being software product revenue; and the other being all else, right. So if we start with all else, we're still in a mixed COVID year. As you know, last year Q1 not really impacted by COVID, this year Q1 has. And as we move forward throughout the rest of the year, and we're expecting some bit of recovery, but net-net, our expectations on everything other than software product revenue is that the year is going to be basically flat to 2020.
And so then that leaves you with software product revenue, and we're pretty optimistic there. We're seeing good engagement from our customers. We're seeing a healthy pipeline. We feel very strongly about our technology and how we compete. And so that's where you're seeing the growth. And, of course, we'll have to see how the year plays out. But like I said, we're cautiously optimistic there.
If I could add to that. I think, sometimes it's undervalued by you guys. But our recurring revenues, I think, in 2020 is something over 92%. So we go into the year and very, very sturdy even in 2020, so we go into the year with pretty high recurring revenue. We expect the attrition on that to be a little bit better than the prior year. When we look at new win expansion, of course, we were a little bit weaker last year there. But we can judge how weak we were against, where we expect we might be. And, all of that together, gives us that cautious optimism as well.
Got you. Got you. Really helpful, guys. Thanks for take my question. Appreciate it.
Thank you.
Thank you. Our next question comes from Ken Wong with Guggenheim Securities. Your question, please.
Great. Thank you for taking my question. This one for you, Jim. In the data space, you have a Southern California based competitor that saw a little bit of softness, and just based on what we're hearing from you guys, it looks like you feel that your business is powered forward quite nicely. Just wondering, maybe what some of the trends you're seeing there? And maybe what some of the differences are in terms of why you guys seem to be resurging forward where they can be seen a little bit of weakness?
So I can't speak to the other guys. But for us, I think we have a very, very strong solution on the data prep side that just continues to go forward. But I think the rest of our offering frankly speaking is quite a bit deeper and broader, and the guide, I assume you're alluding to. And, frankly, all of that integrated with the rest of our business and our targeting things gives us this optimism.
Got it. Got it. And then this one for the Matt and Howard combo. I guess, on the EBITDA guide, it doesn't look like you guys are getting much leverage mix on the full year basis. It looks like it's going to be flat from a margin perspective. Can you maybe just walk us through some of the moving pieces on the spend side whether it's reinvestment versus a rebound in discretionary, or anything else we might be missing from a spend perspective that maybe keeps us from getting more leverage on EBITDA?
Yeah, sure, Ken, I'll take that. So you may be under estimating that a little bit, I think, if you look at how we exited Q4 from a spend perspective. That really is probably your best basis as you move forward through the year. And so you can see we carry that into the Q1 guide in terms of the spend. It's not much incremental spend from Q4 to Q1 at the midpoint of the guide. But then as you look forward through the year, you actually will see off of that run rate, you will see a reduction in our expected spend that's implicit in the guide.
So make sure that you're taking that into account. There's some nice efficiencies there that are coupled with investment in our technology and in sales, and some headwinds that we're seeing from some returned to normal on travel and marketing expenses. So I think it's a pretty fair guide. And actually, I'm pretty happy with that outcome.
Great. Thanks a lot for that, Matt.
Thank you. Our next question comes from Brian Essex with Goldman Sachs. Your question, please.
Hi, good morning, and thank you for taking the question. Maybe, Jim, a question for you, in your prepared remarks, you gave several nice examples of customers significantly restructuring their relationships, but whereas what are the overall trends with regard to adoption of product groups within the Altair unit platform? Are you seeing a meaningful number of enterprises buy for greater flexibility? Maybe, for example, buying multi-physics instead of mechanical engineering to enable usage of perhaps SimLab, Inspire and other adjacent applications?
So the answer is, yes. Actually, the Altair Units model has been very, very well received. It's well received by my account management team, they really appreciate it, because it gives them the ability to get the right value out of customers that are willing to pay more for the extra service features, products, and it lets us basically be competitive and on gaining markets, where the customers are more price sensitive. So I think, our guys are seeing it well, I think the customers are appreciating as well actually very, very fair model for them. And we are seeing the option for sure.
Great. That's good to hear. And maybe just a follow-up to Bhavan's question. On services is the bench of services talent that you have access to limited to a certain group of businesses or verticals, or perhaps certain technology versus some emerging technology? In other words, how applicable are those services, as you continue to extend your model into emerging businesses or additional incremental technology for acquisitions?
We have very, very significantly shifted skill sets that we have, I mean, if you look at the projects that we're doing in electronics, electric vehicle, electric motor, sensors, IoT devices. We are at the state-of-the-art basically battery design. I think you'd be surprised that the expertise that we have now.
Great. That's super helpful. Thank you very much, and congrats on the results.
Thank you.
Thank you. Our next question comes from Matt Hedberg with RBC Capital Markets. Your question, please.
Hey, thank you, and congrats for me as well. And obviously, Howard, great working with you and Matt; look forward to working with you again. I just had one question. And it's really a follow up to Brian's question on Altair units. Obviously, you're seeing success there. And it opens up new opportunities. I guess the question is, when you think about the 2021 guide, how do you contemplate? How pervasive - or may be set differently, the impact on top-line growth with increasing usage of Altair units. Just wondering how you sort of conceptually thought about that as you contemplated the outlook for 2021.
Yeah. So…
I mean, I answer that. But I personally, am not thinking about it at that sort of granular level, and trying to model that. I don't know Matt or Howard have been trying to do that. For us, we're strictly looking at what we see the pipeline looking like.
Yeah, and I can chime in there to Jim. So, Matt, good to hear from you. So some helpful context, I think, so far, as of now, roughly one-third of our customers have actually already converted. So I think that's important to know. And we're going to expect the rest of those customers to be substantially completed within the next year. So we'll see that throughout the year. The way that I'm thinking about it is, is that as these customers convert, they're finding their way into the suite that makes the most sense for them. In some cases, it ends up being slight price increase. In other instances, they're finding a suite that makes sense for them where they can utilize exactly the products that they want.
And so in the first year, I'm not expecting a meaningful impact. But what I think it does set us up for the future, in a way that allows these users to expand within the suites that they're really using. And it allows us to get the value for that, particularly at the enterprise level. So hopefully that answers your question. We're not baking in at the meaningful impact in the year, and so far, and we see as one-third of our customers already converted.
Super helpful. Thanks, guys.
Our next question comes from Gal Munda with Berenberg Capital. Your question, please.
Hey, good morning. Thank you for taking my questions. The first one is just a little bit in the past, you've talked about how the usage has trended, especially towards the end of the year kind of give us a little bit of an update over the year, and maybe I'm not specifically asking about the quarter itself. But just in general, how have you seen usage on solvers evolving throughout the 2020? That'd be very helpful.
Gal, first of all, good morning to you. I think your question was, how do we see the usage of solvers evolving? Is that correct?
No. How has evolved and how did you see it? What was kind of the performance in 2020, just as an overall considering the fact that you had people working remotely? Yeah.
Sorry. The solver suite that we have continues to gain share, we think and grow almost in every area for us, actually. So, if you went back 10 years ago, we were primarily a pre-post company. Today, a very significant part of our business is really on the physics side of the business, and that's going to continue to grow even more as time goes on. So solvers are an ever-increasing part of our overall business and strategy.
Okay. That's helpful. Thank you. Thanks, Jim. And then, in light of your comments about kind of being a little bit more mindful of the way you invest in sales, and really trying to attract those enterprise level sales from - and rebasing some of the other efforts, either into the indirect channel, or [did that] [ph]. How far would you say you progress on the indirect sales channel? Now, you've talked in the past about your ambitions to significantly increase contribution to revenue from that side? Was 2020 kind of a year of foundation? And you expect that to come for in 2021, or any color on that? Thank you.
Sure, we've made some progress, I would say, and it depends on the geography. But, from my point of view, not as much progress as I would like to see, particularly in the Americas. So, I think the inside sales, the business development piece of the business has really gotten a lot of traction for us.
I think the indirect is getting traction more and more in Europe and continuing to APAC. And in the Americas, I think we have some more work to do, quite frankly.
Thank you, Jim. That's very helpful.
Thank you. Our next question is from Mark Schappel from Benchmark. Your question, please.
Hi, thank you for taking my questions. First off, Howard, the best to you going forward. It's good working with you. But, Jim, a question for you, just wondering if we could dig a little bit deeper into your strategic partnership with GE as part of the acquisition. I was wondering if you just could provide some additional details on the arrangement and what we should expect from it going forward.
So, I mean, this is a long coming partnership for us. We've been working with GE for a couple of years now with this technology. It was actually part of the Altair Partner Alliance, and now, the spin-out from GE to be something that we've taken over responsibility for it 100%. There's a very, very large user base of this technology inside of GE. It's in the thousands.
And they are excited, I think, about having commercial software company, take responsibility for it and there's a lot of opportunities, to leverage this, to grow the partnership in many different directions with GE, around all of our software. So that part we're very excited about. There are other projects that we actually have been doing with GE, in the area of rotating machinery and others, independent of the Flow Simulator project.
And coming to Flow Simulator, it's a really terrific piece of technology that was developed inside of GE. Very often, if I can be candid, the OEMs have a lot of internal development that they do, but very often it's not all commercial grade. And they often are looking to spin it out, and very often it's not really competitive. This is not the case here. This is a great piece of technology.
It's getting traction in a lot of customers for us, and we're very, very excited to have it with us. So it's just a very nice partnership with GE. It's a great piece of technology. And it is a model for things that we think we can do with some other customers as well.
Great, thank you very helpful. And then, additional question here. On a quarter or two ago, you released your Inspire Mold solution. I was wondering - and that was a pretty significant capability for the plastics industry. And I know it's still early, but I was wondering if you've had any Inspire Mold wins at the end of the year here that you could talk about.
We have some wins, but probably nothing that I can reach into my bag of tricks and speak about in a coherent way. It's pretty early days and we see a lot of interest in the product. And we're pretty hopeful that we're going to see a lot of traction around it. But it's, frankly, a little early. Ask me in another quarter or two and I'll tell you how we're doing.
I'll make sure to study it more before the next call.
Okay, great. I'll make sure to do so. Thank you. That's all for me.
Thank you.
Thank you. And this concludes our Q&A session for today. I would like to turn the call back to our CEO, James Scapa, for his final remarks.
Yeah. Thank you. So in conclusion here, I just want to thank everyone for their support and feeling great about 2020 with so many challenges, and very excited about 2021. And once again, just want to say a final thank you to Howard for just being a wonderful partner for me for so many years, initially on the Board and then coming in as CFO for the company, helping me to transform our finance department, helping us to go public and just been a wonderful partner for me for so many years, so wishing Howard the best and thanks to everyone else. So long.
Ladies and gentlemen, thank you for your participation in today's program. You may now disconnect. Have a wonderful day.