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Operator
Good day and welcome to the A10 Networks' fourth quarter 2015 financial results conference call.
(Operator Instructions)
Please note, this event is being recorded. I would now like to turn the conference over to Maria Riley, Investor Relations for A10 Networks. Please go ahead.
- IR
Thank you all for joining us today. I'm pleased to welcome you to A10 Networks' fourth quarter and year 2015 financial results conference call. This call is being recorded and webcast live and may be accessed for one year via the A10 Networks' website, www.A10Networks.com. Joining me today are A10's Founder and CEO, Lee Chen; A10's CFO Greg Straughn; and our VP of Global Sales, Ray Smets.
Before we begin, I would like to remind you that shortly after the market closed today, A10 Networks issued a press release announcing its fourth quarter and year 2015 financial results. Additionally, A10 published a presentation along with its prepared comments for this call and supplemental trended financial statements. You may access the press release, presentation with prepared comments, and trended financial statements on the Investor Relations section of the Company's website, www.A10Networks.com.
During the course of today's call, Management will make forward-looking statements including statements regarding our projections for our first-quarter operating results, our expectations for future revenue growth, profitability and operating margin, expectations for customer buying patterns and the growth of our business generally. These statements are based on current expectations and beliefs as of today, February 9, 2016. A10 disclaims any obligation to update information contained in these forward-looking statements, whether as a result of new information, future events or otherwise.
These forward-looking statements involve a number of risks and uncertainties, some of which are beyond our control that could cause actual results to differ materially. We disclaim any obligation to update these forward-looking statements as a result of future events or otherwise. For a more detailed description of these risks and uncertainties, please refer to our most recent 10-Q filed on November 6.
Please note that with the exception of revenue, financial measures discussed today are on a non-GAAP basis and have been adjusted to exclude certain charges. A reconciliation between GAAP and non-GAAP measures can be found in the press release issued today and on the trended quarterly financial statements posted on the Company's website.
We will provide our current expectations for the first quarter of 2016 on a non-GAAP basis. However, we will not make available a reconciliation of non-GAAP guidance measures to corresponding GAAP measures on a forward-looking basis due to high variability and low visibility with respect to those charges which are excluded from these non-GAAP measures.
Before I turn the call over to Lee, I would like to announce that Management will attend the Morgan Stanley Technology Media and Telecom Conference in San Francisco and we hope to see many of you there. Now I'll turn the call over to Lee for opening remarks. Lee?
- Founder and CEO
Thank you, Maria. I would like to thank you all for joining our fourth quarter and year 2015 financial results conference call. We delivered a very strong fourth quarter with revenue exceeding our guidance, achieving our third consecutive quarter of record revenue.
We also continued to drive leverage through our operating structure and improve our bottom line by [70%] year-over-year. Looking at our top-line performance in more details, total revenue grew 25% year-over-year and 12% sequentially to reach $56.6 million. And product revenue grew 22% over last year and 13% over Q3 to reach a record $39.5 million.
We also generated record bookings, added over 200 new customers and expanded our reach within existing customers. Our growth this quarter was driven by a broad-based increase in demand across our product portfolio and customer verticals. We won a multimillion dollar order from a Tier 1 service provider in North America as they continue to enhance their CGM infrastructure. We also grew enterprise bookings 23% year-over-year to reach a new record.
We continue to see adoption of our platform in public and private cloud deployments and saw particular strength for our high-end security focused Thunder product. Revenue for our Thunder TPS solution contributed more than 10% of fourth-quarter revenue, bringing our total TPS revenue for the year to 10% of our total revenue.
I would like to highlight a few recent customer win examples. A global cloud hosting provider that has been A10 ADC customer for over five years chose our TPS solution with our aGalaxy management system to help secure their infrastructure and sell DDoS as a service to their global customers. A large US service provider customer expanded their Thunder TPS deployment in three additional (inaudible) centers to help ward off volumetric DDoS attacks on their public cloud.
A leading Japanese service provider placed follow-on orders for our Thunder TPS solutions that were more than double their initial early 2015 deployment. A global enterprise software company selected our Thunder ADC with SSR offload. This financial client's top 50 company chose A10 because our technical expertise and ability to easily mitigate from the legacy vendors to our solutions.
A leading global financial services customer chose to deploy A10 in two new areas of their networks where we helped them reduce trading [lavency] by half. They are also deploying A10 Thunder ADC solution to replace a competitor in their India [data] centers. And a multinational commodity trading company chose to deploy our Thunder ADC with SSR insight as part of their new firewall infrastructure in order to help alleviate blind spots in encrypted traffic.
The fourth quarter was a strong close to the year. We are pleased we saw momentum throughout the year, driven by our continued execution and innovation. In 2015, we grew revenue 11%, added over 800 new customers and ended the year with a strong backlog. We also continued to expand our market opportunities and widen our technology leadership over the competition with new innovation and industry firsts that map directly to some of the fastest growing networking and security market trends.
First, we introduced a ACOS 4.0 and A10 Harmony Architecture. They are cloud ready and (inaudible). ACOS 4.1 automatically generates a comprehensive set of open application programming interface, or APIs, and provides our Thunder appliance the agility to integrate with third-party cloud management software as we are directly integrating A10's own management solutions.
We also launched aGalaxy 3.0, our powerful centralized management system, (inaudible) ACOS open API for managing ADC and TPS appliances in data centers and private and public clouds. Additionally, we further enhanced our dealer solution with the introduction of Thunder TPS 3.2 that enables more organizations to provide smarter DDoS attack detection and dynamic instant mitigations.
Thunder TPS 3.2 integrates this [very size] cloud DDoS protection service for automatic protection of volumetric attacks. It also leverages ACOS Harmony open API to integrate with existing DDoS detection solutions.
And last quarter we announced our newest software-based security platform, Thunder Convergent Firewall or CFW, which is scheduled for release this quarter. Thunder CFW is a standalone software-based security platform that leverages our ACOS Harmony Architecture and includes a high- performance secure web gateway with SSR insight, a data center firewall, a GI firewall and an IT side-to-side VPN.
Just as we brought carrier and web scale performance to the ADC, with CFW we are bringing carrier and web scale performance to the ADC, with CFW, we are bringing carrier and web scale performance to security. Our advanced technology platform is at the core of our ability to add new customers, expand our reach within our existing customers, and quickly bring new products to market. We believe the trends we see in the market today are in direct alignment with our product strategy and strengths as a Company. We serve the high end of the market and our customers include some of the most demanding enterprise service provider and cloud provider networks.
When we're looking into 2016 and beyond, we see growing transition to the cloud as an opportunity to grow our business, giving our technology differentiations. Our application and security platform is designed to deliver a carrier and web scale application and security performance, integrate with third-party cloud management software our powerful centralized management system with realtime troubleshooting.
Furthermore, we have a strong brand and relationship with the very companies that are investing in and building public and private cloud infrastructures, as we're a software as a service and web 2.0 providers. In fact, 19 of our 20 top booking customers in 2015 were in one of these categories. Furthermore, half of the companies in the leaders and visionary section of [gardener's] 2015 cloud infrastructure of a service magic quadrant are A10 customers.
In summary, we believe that with our highly scalable flexible ACOS software platform we are well-positioned to grow as more security features and functions continue to converge onto cloud-ready platform and as more networks are virtualized and transitioned to the cloud. Over the past year, we believe we have made substantial progress in executing our strategy to build a strong foundation for long-term growth while at the same time improving our bottom line.
With that, I would like to turn the call over to Greg to review the details of our fourth quarter financial performance and first quarter guidance. Greg?
- CFO
Thank you, Lee. And thank all of you for joining us today. Fourth quarter revenue grew to a record $56.6 million, up 25% compared with $45.2 million in the prior year. Deferred revenue grew 27% year-over-year and 10% sequentially to reach a record high of $72.8 million. And revenue for the full year grew 11% to $199 million, up from $179 million in 2014.
Fourth quarter product revenue grew 22% year-over-year to reach $39.5 million, representing 70% of total revenue. This compares with $32.3 million or 71% of total revenue in the prior- year fourth quarter. Service revenue grew 33% to $17.2 million or 30% of total revenue compared with $12.9 million or 29% in the fourth quarter of 2014.
From a geographic standpoint, fourth-quarter revenue from the United States grew 54% year-over-year to reach a record $31.5 million, representing 56% of total revenue. Fourth quarter revenue from Japan was $11.4 million or 20% of total revenue, compared with $10.1 million or 22% of total revenue in the fourth quarter of 2014. Revenue from EMEA was $6.8 million or 12% of total revenue, up 9% year-over-year. And revenue from APAC, excluding Japan, was up 5% year-over-year to reach $5.7 million or 10% of total revenue.
For the full year, the US and EMEA were our fastest growing regions at 25% and 41% respectively. Our enterprise and service provider revenue mix this quarter was 48% and 52% of total revenue respectively. We achieved enterprise revenue of $27.3 million, representing a 16% increase from Q4 of last year. Service provider revenue came in at $29.3 million, up 35% when compared with $21.7 million in the fourth quarter of 2012.
From a customer perspective, as Lee mentioned, we secured a large win with an existing service provider customer in the quarter that when combined with other orders and ongoing purchases from this customer accounted for 19.7% of total revenue in the fourth quarter. For the full year, our revenue was well-diversified with no single customer accounting for more than 10% of our revenue.
As we move beyond revenue, all further metrics discussed on this call are on a non-GAAP basis unless stated otherwise. We delivered fourth quarter total gross margin of 76.4% within our expected range of 75% to 77% and up 60 basis points over the prior quarter. Product gross margin was 75.8% in Q4 of 2015, unchanged from the prior quarter, and compared with 77.2% in the fourth quarter of 2014.
Our services gross margin came in at 77.8%, an increase of 193 basis points versus Q3 of 2015 and a 62 basis point increase from Q4 of 2014. We ended the quarter with staff of 826, up from 816 at the end of Q3. Q4 sales and marketing expense was $27.6 million or 48.7% of revenue, compared with $23.7 million or 46.6% of revenue in the prior quarter. The increase in sales and marketing expense was primarily attributable to higher sales commissions.
Q4 R&D expense totaled $12.2 million or [21.50%] of revenue compared with $12.1 million or 23.8% of revenue in the prior quarter. Fourth quarter combined G&A and litigation expense was approximately $6.7 million or 11.8% of revenue compared with $6.8 million or 13.3% of revenue in Q3. In total, fourth quarter non-GAAP operating expenses were $46.4 million or 82% of revenue compared with $42.5 million or 84% of revenue in the prior quarter.
Fourth quarter non-GAAP operating loss was $3.2 million, compared with a loss of $4 million in the third quarter. Our non-GAAP net loss in the fourth quarter was $3.7 million or $0.06 per share, within our guided range of $0.06 to $0.09 per share.
Q4's net loss represents a 15% sequential improvement compared with the a loss of $4.4 million or $0.07 per share in Q3 and a 70% improvement when compared with a loss of $12 million or $0.20 per share in the fourth quarter of 2014. Basic and diluted weighted outstanding shares for the fourth quarter were approximately 63.7 million shares.
Moving to the balance sheet. At December 31, 2015, we had $98.1 million in total cash and equivalents, a $2.4 million decrease from the end of September and up $6.2 million compared with December 31, 2014. During the quarter, cash used in operations was $4.2 million and for the full year we generated $3.4 million in cash from operations. We ended Q4 with $57.8 million of net accounts receivable compared with the Q3 2015 balance of $41.5 million. Average days sales outstanding increased by one day from the prior quarter to 81 days.
Moving on to our outlook. We are entering Q1 with a very strong backlog -- with a very strong and diversified backlog and are pleased with our strong start to the year. We currently expect first-quarter revenue to be in the range of $52 million to $55 million.
At the midpoint, this represents a 22% year-over-year revenue growth. We expect gross margin to remain in the range of 75% to 77% and operating expenses to be between $45 million and $47 million. For modeling purposes, please note that we are currently planning modest sequential increases in OpEx throughout 2016 and we remain committed to achieving our stated goal of reaching non-GAAP operating income profitability during 2016.
We expect to report a non-GAAP net loss of between $0.07 and $0.09 per share, using approximately 64.3 million shares on a basic and diluted basis. In setting this, are assuming the yen exchange rate remains in the range of approximately 115 to 120.
With that, I would like to open up the call for your questions. Operator?
Operator
We will now begin the question-and-answer session.
(Operator Instructions)
The first question comes from Brett Bracelin of Pacific Crest Securities. Please go ahead.
- Analyst
Thanks. Greg, a couple questions, if I could, on kind of the return to 20% growth here. Bright spot in the US, looks like it was -- bright spot this quarter looks like it was the US, up over 50%.
Walk us through the drivers there. Sounds like you did have a large US, I believe, service provider customer in the quarter that helped drive that growth. Question one.
Question two, as you think about the guide up here looking for another quarter of north of 20% growth, what's giving you the confidence? Is it the continuation of trends in the US? Are you seeing international booking strength? Any color on what's giving you confidence in the sustaining 20%- plus growth here in Q1 would be helpful as well.
- Founder and CEO
Yes, Brett, this is Lee. Let me answer the question first, maybe Greg can add some color to it. I think even without the single largest 19% revenue customer, it would still be a record booking for Q4. So we believe we are very well-positioned in the area where customers are investing, public cloud, private cloud, Web 2.0, and software as a service and we created a high end of market where functionality and performance are important for customers.
And I think the service provider is our sweet spot. The power ACOS platform positions A10 well for the ST market. We enter the Q1 with very strong backlog. We use the same methodology. We use -- look at the pipeline, apply the same methodology, come up with a Q1 forecast and we are very comfortable with our Q1 forecast. Greg?
- CFO
I think relative to the guide and actually when we talk about the prior quarters, we saw very strong and consistent bookings growth throughout Q4 and saw momentum in all of our geographies and across all of our products. And as we look at that and extend with what we saw the pipeline growth being as it led into Q1, it gave us good comfort that that, coupled with our backlog and with where our products are positioned, sets us up very well for Q1. And the fact that we're guiding up is just kind of a fallout of where the numbers came out once we complete our analysis.
- Analyst
Perfect. If you could drill down a little bit into what's driving kind of the strong and consistently improving bookings run rate here? Is it the cable kind of space starting to come back a little bit? Is it outsized kind of wins in cloud? Any additional color maybe by vertical, if you could, in what's driving the consistency on the bookings side here.
- Founder and CEO
I think from the last quarter's record quarter really driven by cloud, security and high-end order market. This is the area we are really strong. We have a technology differentiation.
- Analyst
Okay. Fair enough. Last question for you, Greg, is on -- obviously a year ago as we were kind of were on the call, the big concern was around the cash burn rate. Obviously you generated cash in the last year. As you think about kind of looking over the next year, aspirations to turn profitable at some point this year, but do you expect to generate cash from ops again this year?
- CFO
I think by the end of the year, yes. As we've seen over the last couple quarters is that we can go and generate a couple million dollars, a few million dollars or use a few million dollars. I suspect we'll have that same sort of variance around zero for the next several quarters. And then once we turned operating income profit, we should be cash flow positive at about that same time. So I think as we look forward for the next year, cash is not one of those items that's going to be an item of concern for us.
- Analyst
Okay. Thank you.
- CFO
Thanks, Brett.
Operator
The next question comes from Catharine Trebnick of Dougherty & Company. Please go ahead.
- Analyst
Thank you for taking my question. Nice quarter. I have two. One, a housekeeping. You did indicate that your sales number was up this quarter significantly. Can you go back through, I might have misdialed into the call, as to why that was so high this quarter? Sales and marketing was like $27 million. It was up quite a bit.
- CFO
The sales and marketing expense. The primary driver on that, the increase there was the sales commissions. As in Q4, you've got people who are moving into accelerators, but also as we have backlog, that becomes a commission item as well. So these are items that are just Q4 oriented.
Notice, we're not taking overall expenses down dramatically into Q1. So as we move into Q1, it has more to do with headcount and some of the Q1 activities that start to pop into place. But there's no fundamental change in how we're doing sales and marketing in Q4 that drove that.
- Analyst
And then the other question is really to do with the competitive landscape. On your -- Lee, on your entry you talked a lot about some nice wins, particularly in the DDoS area. Are you taking share or are you seeing new opportunities? And that question's related to both the carrier environment and the enterprise. Thanks.
- Founder and CEO
Yes, I think the -- our focus really continues to be technology and performance to be the technology and performance disrupters. So completely has been around since we started the Company. It's nothing new. But we continue to serve the high end of the market where the [ostrance] is about the --[ostance] about performance, about functionality are important for customers.
Also our security, we branch into security offering. I think that has really helped increase the pipeline and the deal, also expand into our existing customers. Additionally we sell ADC and now we can sell TPS in addition to ADC for most of our customers.
For some of these service provider customer, we have three products we sell, ADC, CGN and TPS. I think that has really helped drive the market. Also the cloud. Cloud [hasn't] really helped drive the revenue for the last quarter and we continue to see the movement to cloud.
- Analyst
Okay. The reason I was asking is Radware just recently reported and they're still struggling with some carrier spending and it looks like you're doing quite well on the carrier spending. I was just trying to rectify. Have you seen any pause in carrier spending for any of your three opportunities or do you continue to see strong growth in 2016?
- Founder and CEO
I think we are well-positioned in the service provider market, service provider has been our sweet spot for years. It's really our technology, the (inaudible) costs, they really differentiate us from our competitions.
In the last quarter, our SP spending has been fairly strong. So we can't call a quarter a trend but we have not really see a incremental headwind to the SP. Service provider always going to be lumpy, but we like our position. Now we have more products to sell into the space so we feel good about our position with SP customers.
- Analyst
All right. Thank you.
Operator
The next question comes from Ittai Kidron of Oppenheimer. Please go ahead with your question.
- Analyst
Thanks. Hi, guys and congrats on a good quarter. I wanted to dig in into this large customer and kind of get your perspective on whether the upside in the quarter came from that customer or it came from others. I'm just trying to make a -- get a better understanding of how much visibility you had into that customer and how much you will spend into December.
And also what are your working assumptions with regards to that customer or any other 10% customer in March? Is there a 10% customer expected? What I'm hoping to avoid is a situation where there's a big gap to kind of fill in somewhere in the mid year.
- CFO
Hi, Ittai, thanks for the note there. As it pertains to this particular customer, I want to call out a couple things. One is that it wasn't a 19% deal with the customer. They were a 19% customer. So the large deal did not represent that entire amount.
Secondly is that as we went into guidance, we had pretty good visibility on this transaction. So there's really nothing about it that was a surprise. So the upside as we move through the quarter was primarily driven by what I mentioned earlier, which was the consistent strong bookings across a lot of products and a lot of regions. And so it was kind of that cumulative effect as opposed to this deal dropping into the quarter.
And then when we look at whether this creates a hole in Q1, if you recall back in Q3, we had -- I'm sorry, Q2, we had a large deal as well. There was concern that that created a hole in Q3 and it did not. So the same thing is true here. We had a strong backlog going into Q1, strong sales momentum, good confidence in the pipeline and so we don't feel like we're stepping out ahead of ourselves on the Q1 guidance. We're confident that all the elements that we have together in business will make that number a reality.
- Analyst
Okay. Excellent. And then second question is with regards to the business environment, we all look what's going on around us in the rest of the world. What is it that you're seeing -- Lee, what is it that you're seeing out there? A lot of FX movement in many regions, Latin America and Asia, clearly a lot of macro issues are surfacing here and there. What are you hearing from customers? How do you get comfort that what you see is what you'll get?
- Founder and CEO
I think we read the same headline as you did. We are not immune to the macroeconomies. In the last quarter, LatAm has been a challenge for us, especially Brazil. But on the other hand, overall we are pleased with our growing momentum.
We ended the quarter with a very strong backlog and our pipeline's growing. We are seeing continued movement through the cloud and I feel we are very well-positioned to the public and private and hybrid cloud. And Web 2.0 software as a service, these are all the area I think we have strong position in. Also, our high end, the security offering has been really gaining a lot of tractions. So overall we feel confident entering the Q1.
- Analyst
Okay. Very good. Lastly for Ray. Ray, on the enterprise side, it's the second year in a row, I guess, that the enterprise business is down sequentially in fourth quarter, which is counterintuitive. You'd think budget flush plus your year end as well, salespeople pushing. What is it that makes for a sequential decline in that fourth quarter? How do I get my hands around that?
- VP of Global Sales
So, Ittai, this is Ray. How you doing?
- Analyst
Good.
- VP of Global Sales
I think from a bookings perspective, you would see a very different story. So from a revenue perspective, you see the decline, but we had a very strong bookings quarter. And even though the service provider market looked very strong on the revenue side, we saw very strong bookings on the enterprise side as well. So I think you're getting a somewhat of an incomplete picture there. We actually feel very strong about our position in enterprise as well as growing service provider.
- Founder and CEO
Yes, our enterprise booking in Q4 actually grew 23% year-over-year.
- Analyst
Okay. Very good. Excellent. Good luck. Congrats, guys, good luck.
- VP of Global Sales
Thanks, Ittai.
Operator
The next question comes from Rod Hall of JPMorgan. Please go ahead.
- Analyst
Hi. Thanks, and thanks for taking my questions. This is Ashwin on behalf of Rod. I wanted to go back to this multimillion dollar deal with the service provider customer. Lee, I remember you mentioned about large deals possibly in the pipeline in mid-2015. Is this the deal that you were talking about six months ago?
And kind of related to that, over what time frame do you think you'll continue to (inaudible) revenue on this deal?
- Founder and CEO
For the service provider, we always have large deal in the pipeline. So I don't know if this is referring to the same multimillion-dollar deals. But I want to just like clarify. Even though it's a large multimillion-dollar deals, it's not comprised our 19% revenue. Even without a 19% revenue customer in Q4, we still will have a record booking quarter.
Greg, maybe you want to add.
- CFO
Ashwin, what was the second half of your question there about --?
- Analyst
Over how many quarters do you think you'll continue to recognize revenue from the deal?
- CFO
The product piece of it was all shipped and recognized within Q4. And then the maintenance that's related to that will be recognized over a year, so that particular deal has most of it in Q4 and then it will have some services piece over the next, I think it's 12 months.
- Analyst
Great. And then I have a follow-up on gross margins. As the number of SKUs in your product portfolio increase and more security products are going to be available soon, first, I wanted to ask about the predictability of future gross margins. Do you feel your confidence level in predicting gross margins would change materially as new products get added to your portfolio?
And second, how should we think about margin impact from the upcoming security products?
- CFO
Well, at the individual product level, our security products tend to have a higher gross margin than the classic ADC products. And so taken as a unitary thing, they would tend to have upwards influence.
On the other side of that equation, as we expand into some developing countries, the gross margins there tend to be lower. So there's a little bit of a push-pull on multiple factors within each quarter. And we feel like we're getting better at forecasting that.
The SKU impact is something that we're trying to mitigate. We've done some more things with our supply chain to make our manufacturing more predictable, to bring down lead times, to have more cross-utilization from one product to the next. So over time we expect that our supply chain activity will be additive to gross margin as opposed to subtracting from it.
- Analyst
Great. Thank you.
Operator
(Operator Instructions)
The next question comes from James Faucette of Morgan Stanley. Please go ahead.
- Analyst
Hi. This is Eugene Anderson on for James. Thanks for taking my question. Just a little bit more on the enterprise side of things. How much of your activity was driven more by new customers versus, say, like repeat sales? And perhaps within repeat, are you seeing a trend towards higher deal sizes and perhaps upselling towards other products?
- CFO
We tend not to break down our results between those two, but we can give you some color here and I'll start off and Ray may want to throw in some antidotes on this as well. Within any given quarter, we added 200 new customers this quarter. We've been at roughly 200 each quarter throughout this year. And so there's a good, strong flow of new customers kind of across the size spectrum, some very large, some mid-market.
But one of the things that we do pride ourselves on is the frequency of repeat buying behavior by our existing customers. And that's both within the product that they made their initial purchase in as well as movement across. So most of our service provider customers have both a CGN and an ADC somewhere in their network.
A lot of the folks who have picked up TPS so far have started to either buy or look at buying our ADC product. And as we bring CFW to market, we would expect that to continue as well. So I think that our existing customers are a great revenue source and they're actually a great reference source for us as we talk to our new customers.
- VP of Global Sales
Just to add a little bit to that, Eugene -- this is Ray. So with existing customers, the benefit we get from that relationship is that they grow, we grow. And if we maintain a good relationship, as you saw with our top revenue-producing customer in the quarter, that's a repeat customer and we continue to benefit from those relationships.
But as Greg mentioned, we had 800 new customers for the year, about 200 per quarter. That's a very nice rate for us. So we are definitely penetrating on the high end with our high-end solution cloud and security is definitely having an impact, especially on the enterprise side.
But the good news is that the base is also continuing to grow. So not all 200 customers are the highest end customers and our existing customers continue to come back for more. So we're seeing a very good cycle here and it's a great platform. The power's in the platform. It delivers a really great solution for the kind of customer we sell to. We qualify hard and we sell with very high win rate.
- Analyst
If I could just quickly nitpick the OpEx guidance just for a second there. So we're seeing a slight bounceback in R&D. Is that something we should expect? I'm just trying to kind of jive that with what's probably going to be a sequential decline in sales and marketing for this quarter.
- IR
Can you repeat your question? I'm not sure where you're going. You're asking about the sequential uptick in R&D?
- CFO
You mean from Q3 to Q4?
- Analyst
That's correct, yes.
- CFO
I think it's about a $125,000 increase there. So it's kind of in the rounding of things. You have bonuses that come to play at the end of the year. So it's not a heavy new investment. We will see growth in Q1 across both sales and marketing and R&D, however.
So we're continuing to invest in both those pieces of the business. Again, at a lower rate than our revenue growth is expected over the course of the year, because whatever investment we make on the expense side will be more than exhibited on the revenue growth and that's how we get to our end-of-year profitability goal.
- Analyst
Thanks so much.
Operator
This concludes our question-and-answer session. I would like to turn the conference back over to Lee Chen, Founder and CEO, for any closing remarks.
- Founder and CEO
Thank you all of our shareholders for joining us today and thank you for your support. Thank you and good day.
Operator
The conference has now concluded. Thank you for attending today's presentation. You may now disconnect.