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Operator
Good morning, and thank you for standing by for Xunlei First Quarter 2018 Earnings Conference Call. (Operator Instructions) Today's conference call is being recorded. I would now like to turn the call over to your host today, Dr. Eric Zhou, Chief Financial Officer of Xunlei. Please go ahead, sir.
Eric Zhou - CFO
Thank you, Adrian. Hello, everyone. Welcome to Xunlei's First Quarter of 2018 Conference Call. I'm Eric Zhou, CFO of Xunlei. I'm joined by the company's CEO, Mr. Lei Chen. Today's conference call is being recorded. And a replay of the call will be available on our IR website following the call. Our earnings press release was distributed earlier today and is also now available on our website.
Before we begin, I'd like to remind you of the company's safe harbor statement in connection with today's conference call. Please note that the discussion today will contain forward-looking statements made under the safe harbor provisions of the U.S. Private Securities Litigation Reform Act of 1995 and that these statements are subject to risks and uncertainties that may cause actual results to differ materially from our current expectations.
Please refer to our SEC filings, including our recent annual report on Form 20-F, for a more detailed description of the risk factors that may affect our results. We do not assume any obligations to update any forward-looking statements, except as required under applicable laws.
During this call, we will refer to both GAAP and non-GAAP financial measures. And the non-GAAP measures are reconciled to the comparable GAAP measures in the table attached to our earnings press release, which can also be found on our website. Please note that all numbers are in U.S. dollars, unless otherwise stated.
Before we're starting the question-and-answer session, I will now turn the call over to our CEO, Mr. Lei Chen, for prepared remarks.
Lei Chen - CEO & Director
Thank you, Eric. Thank you all for joining us today for our first quarter of 2018 earnings conference call. We had an excellent start in 2018. We grew our revenue by 118% on a year-over-year basis and achieved profits for 2 consecutive quarters. I'm very proud of the fact that we enjoyed a revenue growth for 9 consecutive quarters. And I'm grateful that we have an exceptional team. And I want to thank them for their tremendous efforts and achievements.
During the quarter, total revenues were USD 78.8 million, which represented an increase of about 118% on a year-over-year basis. On a sequential basis, revenues declined 4.4% due to the seasonality impact of the Chinese New Year holidays and the contract revenue in the previous quarter. Our total revenues would have increased about 2.8% if we excluded the contract revenue in the previous quarter. The growth was mainly driven by our cloud computing and Internet value-added services, which grew by approximately 316% as compared with the same period last year.
In as early as 2015, we started to develop shared cloud computing products as we saw significant growth opportunities with the emergence of Internet of Things, AR, AI and big data. We transformed the users' idle bandwidth and storage to offer cloud computing services to our enterprise customers. By our shared computing model, we helped our customers to reduce cost and improve performance.
Lately, we have seen a trend of similar and relevant technologies, such as Edge Computing and Serverless PaaS sprouting out from different technology thinkers and evangelists. We believe this trend will continue for a couple of reasons. First, IoT becomes more important and starts to fundamentally change how we live and how we conduct business. This leads to a variety of applications, where such technologies provide better solutions.
And secondly, the demand for bandwidth, storage and computing power grows rapidly while the cost of CPU, flash and other computing units reduces at a much slower pace. We even saw a reversed price trend in some of these units. A solution that can fundamentally reduce cost will become more and more desirable in this market. That's also why we keep upgrading our technology and have recently expanded our cloud service to IaaS domain with our new cloud platform, StellarCloud.
To strengthen our leadership in distributed cloud computing, in September 2017, we launched a new product, OneThing Cloud, which is a blockchain-based smart hardware device and serves as a personal private cloud. The online personal cloud market is very big. For example, China has more than 400 million personal cloud users according to market research.
By offering a hardware at your home and satisfying the same need, OneThing Cloud provides better privacy, security and user experience than traditional personal cloud services. In addition, OneThing Cloud users can voluntarily share their idle computing resources that can be transformed into enterprise-level computing resources. We believe cloud computing will be an important industry trend and a key driver for our long-term growth. That's why we invest heavily in this technology.
In addition to our shared cloud computing technology, blockchain technology and its applications are another key area of our focus. I am pleased to report that during the first quarter of 2018, we made significant strides in upgrading our blockchain infrastructure. We recently launched our ThunderChain, a high-performance blockchain platform that can concurrently conduct over 1 million transactions per second. The application of ThunderChain has already helped resolve a few critical issues facing our shared computing model. We also aim to have blockchain technology benefit more companies, industries and individuals.
ThunderChain will help companies and developers create decentralized applications that empower corporations and end users across various industries, including copyrights, logistics, health care and public sector. With ThunderChain, we have taken the first step in building a Xinlei blockchain ecosystem that involves companies' developers and end users. We are very excited about its prospects and its potential influence on the broader industry.
I'd also like to touch on our subscription business. Over the years, our membership subscription business has provided us with stable cash flows to pursue growth and innovation opportunities. It's especially important that our company has been transitioning from a traditional Internet company into an innovative technology provider, driven by the power of sharing economy and the potential of blockchain technology.
So it's encouraging to see that the subscription business remained steady over the past quarters. Although the number of subscribers were down to 3.81 million from 4.25 million as of last quarter, revenues from subscriptions were $23.4 million, representing an increase of 12.3% on a year-over-year basis, an increase of 3% sequentially.
Finally, let me turn to our mobile products. Xunlei Mobile, our mobile app, allows users to search and download content, distribute short videos and participate in live video programs. We are delighted to see that our mobile application continued to generate strong revenue for us. Mobile advertising revenue grew 95.4% on a year-over-year basis, down slightly 4.1% from last quarter due to the seasonality reasons of Chinese New Year.
With that, I would now turn the call over to Eric to review the first quarter financial results. Eric, please.
Eric Zhou - CFO
Thank you, Lei. Hello, everyone. And once again, thank you for joining Xunlei's First Quarter of 2018 Conference Call. We started 2018 with solid financial performance. Our total revenues increased about 118% on a year-over-year basis and decreased 4.4% sequentially despite the seasonality impact of the Chinese New Year holidays. Overall, we are very pleased with the results.
Going forward, we will continue to expand our distributed cloud computing and industry-leading blockchain-based products and services, and at the same time, strengthen the portfolio of our traditional products. Our goal is to pursue sustainable growth while striking a balance between revenue growth and profits. And now I'd like to go through the details of our financial results.
Our total revenues were $78.8 million, representing an increase of approximately 118% as compared with the same period last year. The increase in total revenues was mainly attributable to the growth of cloud computing, live streaming and mobile advertising business.
To date, revenues in the previous quarter -- total revenues in the previous quarter included technology solutions service income from Xiaomi of $5.8 million, which covered the services from 2016 to mid-June 2017. And it was recorded in Internet value-added services revenues. The service agreement was still in the renewal process during the first quarter of 2018. And therefore, no such service income was recognized during the quarter. If we had excluded the above service income, the total revenues would have increased 4.8% sequentially.
Revenues from cloud computing and Internet value-added services were $48.1 million, representing an increase of 316.4% on a year-over-year basis and a decrease of 7.3% sequentially. Cloud computing revenues grew by 395.3% and 9.4% on a year-over-year basis and sequentially, respectively. Revenues from subscriptions were $23.4 million, representing an increase of 12.3% on a year-over-year basis and an increase of 3% sequentially. The year-over-year increase in subscription revenue was primarily attributable to increase in average revenue per subscriber.
The average revenue per subscriber for the first quarter of 2018 was RMB 38.8, an increase from RMB 34.4 as of December 31, 2017, and RMB 35.1 as of March 31, 2017, respectively. The number of subscribers were 3.81 million as of March 31, 2018, decreased from 4.25 million as of December 31, 2017, and 4.08 million as of March 31, 2017, respectively.
The company continues to transition from a traditional Internet company to one with growth drivers coming from innovation and investments in industry-leading technology and products. Revenues from online advertising were $7.3 million, representing an increase of 92.2% on a year-over-year basis and a reduction of 6.8% sequentially. Mobile advertising revenues increased 95.4% on a year-over-year basis.
Costs of revenues were $40.5 million, representing 51.5% of our total revenues. Bandwidth costs were $16.5 million, representing 20.9% of our total revenues, compared with $14.7 million or 17.9% of our total revenues in the previous quarter. The remaining costs of revenues were largely the manufacturing costs of our OneThing Cloud product and the revenue-sharing costs for our live streaming business.
Gross profit for the first quarter of 2018 was $37.7 million, representing a decrease of 5.2% sequentially. Gross margin was 47.8% and decreased from 48.2% in the previous quarter. Research and development expenses for the first quarter of 2018 were $16.5 million, representing 20.9% of our total revenues, compared with $20.6 million or 24.9% of our total revenues in the previous quarter. The decrease on a sequential basis was mainly due to the annual bonus for the year 2017 accrued in the previous quarter.
Sales and marketing expenses for the first quarter of 2018 were $6.8 million, representing 8.6% of our total revenues, compared with $7.5 million or 9.1% of our total revenues in the previous quarter. General and administrative expenses for the first quarter of 2018 were $7 million, representing 8.9% of our total revenues, compared with $7.7 million or 9.4% of our total revenues in the previous quarter.
Operating income was $7.4 million in the first quarter of 2018 compared with operating income of $3.9 million in the previous quarter. Net income from continuing operations was $6.7 million in the first quarter of 2018 compared with $3 million in the previous quarter. Non-GAAP net income from continuing operations was $7.9 million in the first quarter of 2018 compared with $4.8 million in the previous quarter.
Diluted earnings per ADS from continuing operations in the first quarter of 2018 was $0.10 as compared with a loss of $0.14 in the same period the last year and an income of $0.05 in the fourth quarter of 2017. As of March 31, 2018, the company had cash, cash equivalents and short-term investments of $355.6 million compared with $372.4 million as of December 31, 2017. CapEx for the first quarter of 2018 was approximately $0.8 million.
And finally, I would like to turn to our guidance for the second quarter of 2018. We expect total revenues to be between $56 million and $62 million for the second quarter of 2018. The midpoint of the range represents a year-over-year increase of about 53.2%.
With that, we conclude our prepared remarks today. And I will now turn the call over to the operator for your questions. Adrian, we are now open to the questions.
Operator
(Operator Instructions) The first question comes from the line of [Jack Wu].
Unidentified Analyst
This is [Jack Wu] again. And I have a couple questions. First off, the guidance for the second quarter has been reduced compared to the first quarter. What is the reason for this guidance?
Eric Zhou - CFO
Yes. You said you have 2 questions? So that was the first question, right?
Unidentified Analyst
Yes, I have several questions. Yes, this is the first question. The guidance has been reduced compared to first quarter. Is there any particular reason behind this?
Eric Zhou - CFO
Yes, well. (foreign language) So I want to address the question in Chinese and have [Oleg] to translate into English. So first of all, our cloud computing business is transitioning. And so (inaudible) the enterprise users will exchange for cloud services with LINK token. (foreign language) Because we allow enterprise users to exchange cost services with LINK token, the cash revenue will therefore decline. (foreign language) Here, I want to explain our business model. (foreign language) Once being called users, can learn to rejoin the reward program (foreign language) to share their idle computing resources in order to get LINK token. (foreign language) LINK token can then be exchanged for the services that the company use through ThunderChain or StellarCloud. (foreign language) On the prospective enterprise, so these users will exchange the idle computing resources shared by the personal users. And then they can provide the services or products to these personal users. (foreign language) So there will be a closed loop system with the use of LINK token. (foreign language) So accordingly, compare with our previous model, Xunlei will then see the decline in our cash revenue. (foreign language) In the meantime, we also expect the sale of OneThing Cloud in Q2 to somewhat decline. (foreign language) At this stage, the distribution of the OneThing Cloud, the number is actually enough to support the cloud business of Xunlei. (foreign language) So we stopped the promotion campaigns when we first released the OneThing Cloud. (foreign language) The beta price of OneThing Cloud now covers -- recovered to our original price, which is RMB 599. (foreign language) Compare with that, at the beginning, when we launched the product, the promotion price was RMB 339. (foreign language) In the near term, we will not launch [OneThing Cloud Pro] or any other new products. (foreign language) In this stage, our goal is to take a full use of the computing notes by OneThing Cloud. (foreign language) However, we will also adjust our sales strategy based on our business development of StellarCloud. (foreign language) And here, I also want to emphasize that the revenue from CDN business compared with quarter-over-quarter basis was increased (inaudible) 29.5%. (foreign language) This is our response to the Q2 guidance.
Unidentified Analyst
And my second question has to do with ecosystem. I know that Xunlei has released ThunderChain. And it's encouraging people or company or business to join this application. And that will establish Xunlei ecosystem. Now how does that -- how will that benefit Xunlei in the future with this ecosystem? This is my second question.
Lei Chen - CEO & Director
(foreign language) So recently, we launched the ThunderChain, which is based on our blockchain technology. And the trend we have been seeing at the moment is mostly public chain is actually in the U.S. Let me answer this in English. So ThunderChain is, well, the first public chain that is offered in China. And we have seen many developers to contact us and started to develop blockchain applications on top of our ThunderChain. So we are seeing some applications that are developed on our blockchain has potential to have strong impact on the real economy. Many of such applications are aimed for consumers instead of enterprise users because they need the throughput, high performance that ThunderChain provides. So they select ThunderChain. And it is pretty much their only choice when developing blockchain applications on top of the public chain in China. So we believe such an ecosystem may give us advantageous position in the future.
Unidentified Analyst
My third question has to do with tomorrow's event. Is there -- I mean, there is a big event planned in Beijing tomorrow. Is there any information? As we know, many of us will not be able to attend this event or listen live. Is there any further information or -- and any preliminary information you can share with us today?
Lei Chen - CEO & Director
Thank you, Jack. So yes, it's true we're planning to have a launch event tomorrow in Beijing. The launch event will launch 3 new products and they are business-facing. So we said we expanded our service area from CDN to a more general cloud computing domain. So tomorrow, we will launch 3 new products that expand our horizon in the cloud computing business. On top of that, we will launch our ThunderChain ecosystem. And we will showcase a few application development teams, who developed very interesting applications on top of our blockchain. And we'll also talk about policies around how to develop applications on our ThunderChain and what Xunlei can provide to the developers who intend to develop applications on ThunderChain.
Unidentified Analyst
My last question has to do with class actions in the United States. As you know, many of us are concerned about the outcome of the class action. Although we are confident with the result, but is there anything you can share at this moment regarding the class action that is going on in the United States?
Lei Chen - CEO & Director
So the proceedings are still at an early stage. So far, pursuant to the latest court order, a brief schedule for filing lead -- fulfilling lead plaintiffs, consolidated amended complaints will be due in the next couple of months. So it's still very early stage. And I think it's going to -- we'll update the market when it is appropriate.
Operator
(Operator Instructions) There are no further questions. I would now like to hand the conference back to our presenters for today.
Eric Zhou - CFO
Thank you, Adrian, and thank you all again for your kind attention. And please feel free to contact us if you have any questions, and have a great day.
Lei Chen - CEO & Director
Thank you. Bye-bye.
Operator
Ladies and gentlemen, that does conclude the conference for today. Thank you for participating. You may all disconnect the call lines now. Thank you.