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Operator
Welcome to the IRadimed Corporation First Quarter 2022 Financial Results Conference Call. (Operator Instructions) As a reminder, this call is being recorded today, April 29, 2022, and contains time-sensitive information that is accurate only as of today.
Earlier, IRadimed released its financial results for the first quarter of 2022. A copy of this press release announcing the company's earnings is available under the heading, News, on their website at iradimed.com. A copy of the press release was also furnished to the Securities and Exchange Commission on Form 8-K and can be found at sec.gov.
This call is being broadcast live over the Internet on the company's website at iradimed.com, and a replay of the call will be available on the website for the next 90 days. Some of the information to be furnished in today's session will constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements are those focused on the future performance, results, plans and events and may include the company's expected future results.
IRadimed reminds you that future results may differ materially from these forward-looking statements due to several risk factors. For a description of the relevant risks and uncertainties that may affect the company's business, please see the Risk Factors section of the company's most recent reports filed with the Securities and Exchange Commission, which again may be obtained for free from the SEC's website at sec.gov.
I would now like to turn the call over to Roger Susi, President and Chief Executive Officer of IRadimed Corporation. Mr. Susi?
Roger E. Susi - Founder, Chairman, CEO & President
Thanks, operator, and good morning, and thank you all for joining us on the call this morning. IRadimed had another very good quarter of revenue and earnings growth as was reported in this year -- in this morning's release. The trend of strong demand for our products remains intact and thus we feel very good about the coming quarters as well.
As reported in this morning's release, first quarter revenue was $12.3 million, nearly a 34% increase over the first quarter last year. Non-GAAP earnings were $0.22 or 69% over Q1 2021. I'm very pleased with these results and the strong start our company has had in 2022.
Our sales team continues to perform well, increasingly driving customer demand for our products. Total Q1 bookings remained at record levels, coming in 52% higher than Q1 last year. Strong demand for our products has given us additional visibility through a growing backlog, which increased from its year-end level of $10.9 million.
Our engineering and regulatory teams continue to work closely on obtaining 510(k) clearance for our next-generation IV pump, which has been branded the MRidium 3870. We continue working diligently to meet our time lines for the second half of this year. And while there is still much to complete, we are committed to doing everything we can do to achieve our goal.
Regarding our new ferromagnetic detection system, we plan to install our first placements this quarter with a growing number of installations from that point on. As I have said in the past, we are very -- we feel very good about where we are with this product and believe that we have a technologically superior system compared to the others already in the field.
Regarding our financial guidance, we have considered the booking trends and the added visibility we have through growing backlog. We've also considered the macro risk associated with supply chain and feel confident in increasing our full year expectations. Those supply issues are a near-daily consideration at some level, and supply and stability is now a familiar norm the world over. As we have the means and tenacity to find workaround solutions as necessary, we have comfort that we can continue to make shipments without material delay.
Considering Q1 with an eye on sales levels and deal count, we now expect full year 2022 revenue of $52.5 million to $53.2 million, with GAAP earnings of $0.89 to $0.95 and non-GAAP earnings of $0.96 to $1.03. Additionally, for the second quarter this year, we expect revenue of $12.5 million to $12.7 million, with GAAP earnings of $0.21 to $0.23 and non-GAAP earnings of $0.23 to $0.25.
Now before turning the call over, I'd like to address the executive transition that we announced yesterday afternoon. As disclosed, Chris Scott has resigned from the company effective May 27 to pursue other opportunities. Over the next 30 days, he'll be focused on a smooth transition of financial responsibilities to Matt Garner, who will serve as interim CFO while we go through a search process.
Chris has been a valued partner to me and the rest of the organization during his 8-plus years here. He has supported the company every step of the way and will be missed. Sorry as we are to see him go, he leaves a very capable finance team and the company in good shape, which the finance team will now be led by Matt. This has been the situation for the last several years. I'm confident in Matt's abilities and -- to maintain the quality and integrity of our financial information during the search process.
And now I'd like to turn the call over to Matt so he can introduce himself and to review the financial results of the quarter. Matt?
Matt Garner
Thank you, Roger, and good morning, everyone. Before summarizing the financial results, I'd like to spend a moment and introduce myself. I began with IRadimed in February 2014 as the Assistant Controller, and in 2020 was elevated to the Controller role. Over these last 8 years with IRadimed, I've developed a deep understanding of the company and its culture.
Overall, I have 15 years of experience within the medical equipment industry, including 7 years at Roger's former company. I also hold a Bachelor's Degree in Accounting from Southern New Hampshire University. I am thankful for the opportunity to serve as the company's Interim CFO and look forward to interfacing with you while the search proceeds.
Now on to the financial summary. As in the past, I will be discussing these results on a GAAP basis as well as on a non-GAAP basis. You can find a description of our non-GAAP operating measures in this morning's earnings release. You can also find a reconciliation of these non-GAAP measures to the nearest GAAP measure on the last page of today's release.
As reported earlier this morning, first quarter 2022 revenue was $12.3 million, an increase of 33.5% compared to the first quarter of 2021. Revenue from domestic sales increased 37.2% to $10 million and revenue from international sales increased 19.5% to $2.3 million. Overall, domestic revenue accounted for 81.1% of total revenue for Q1 2022 compared to 78.8% for Q1 of 2021.
Device revenue increased to 38.8% to $8.5 million. This was driven by a 99.5% increase in monitor revenue resulting from continued customer acceptance and win rates. The average selling price of our MRI-compatible IV infusion pump system during the first quarter 2022 was approximately $33,800 compared to approximately $32,700 for the first quarter of 2021. This increase relates to higher domestic unit sales, partially offset by an unfavorable product sales mix.
The average selling price of our MRI-compatible patient vital signs monitoring system during the first quarter of 2022 was approximately $46,800 compared to approximately $38,300 for the same period in 2021. This increase relates to higher domestic unit sales and price increases that we began implementing during the second half of 2021. Revenue from disposables and service increased 25.9% to $3.3 million for the first quarter of 2022. And revenue from our maintenance contracts was consistent at $0.5 million for both periods.
Gross margin was 76.2% for the 2022 quarter, compared to 76.6% for the 2021 quarter. The decrease in gross margin percent is primarily due to unfavorable labor and overhead expenses, partially offset by higher domestic sales. While the supply chain remains challenging, we continue to believe that any negative impact from higher costs will likely be limited and partially offset by higher levels of unit production, resulting in gross margins that are consistent with our historical ranges.
Operating expenses were $6.3 million or 51.2% of revenue, compared to $5.3 million or approximately 57.3% of revenue for the first quarter of 2021. On a dollar basis, this increase is primarily due to higher sales commissions, payroll and benefit costs, sales activity expenses and engineering costs for prototyping and design. As a result, income from operations grew 73% to $3.1 million for the 2022 quarter.
We recognized a tax expense during the first quarter of 2022 of approximately $573,000, resulting in an effective tax rate of 18.7%, compared to a tax expense of approximately $384,000 in the 2021 quarter. This increase is due to higher taxable income, partially offset by benefits associated with stock compensation and research and development credits.
On a GAAP basis, net income was $0.20 per share compared to $0.11 for the 2021 quarter. On a non-GAAP basis, adjusted income was $0.22 per diluted share for the 2022 quarter compared to $0.13 for the first quarter of 2021. Cash from operations grew to $1.4 million for the 3 months ended March 31, 2022, from $0.9 million for the same period in 2021. For the 3 months ended March 31, 2022 and 2021, our free cash flow, a non-GAAP measure, was $1.2 million and $0.8 million, respectively.
And with that, I will turn the call over for questions. Operator?
Operator
(Operator Instructions) Our first question comes from the line of Scott Henry with ROTH Capital.
Scott Robert Henry - MD, Senior Research Analyst & Head of Pharmaceuticals Research
First, Chris, best of luck to you. It's been a pleasure working with you. Second, Roger, you told us the name of the next-generation pump. What was that again?
Roger E. Susi - Founder, Chairman, CEO & President
We call it the 3870, it's [the model]. We use the same MRidium name of the -- that was carried to these pumps for all these years. We had a 3850, we -- current pumps at 3860. This one we're calling a 3870.
Scott Robert Henry - MD, Senior Research Analyst & Head of Pharmaceuticals Research
Perfect. And is there any update as far as correspondence with the FDA, and how we should think about the time line for approval of that product?
Roger E. Susi - Founder, Chairman, CEO & President
Yes. We've had a couple of calls actually, Scott, in the last 6 weeks -- yes, in the last 6 weeks. Yes, so the communications have been, I'd say, good. Okay. So that -- those communications are in the form of what we call information request, clarifications to the questions that we've been trying to answer formally, you can submit and have such calls.
So they've engaged with us, and that's been positive. And on this end, as I said, we're working -- we're -- it's all hands on deck there in our regulatory and engineering side, answering this host of questions. And we plan to get them to the FDA in August. And then we hope that they can pull their support in and take care of business on their end and get this thing done.
Scott Robert Henry - MD, Senior Research Analyst & Head of Pharmaceuticals Research
Okay. Thanks for the update there. And I think I heard on the FMD product, no revenues in Q1, but should we expect to see revenues in Q2?
Roger E. Susi - Founder, Chairman, CEO & President
Yes, yes. We're going to start to install a couple of these ones that we've had these orders booked on.
Scott Robert Henry - MD, Senior Research Analyst & Head of Pharmaceuticals Research
And you booked the revenues post installation. Is that correct?
Roger E. Susi - Founder, Chairman, CEO & President
Yes.
Scott Robert Henry - MD, Senior Research Analyst & Head of Pharmaceuticals Research
Okay. Just a couple of final questions. How is the pricing environment? I mean, given kind of the inflationary backdrop, do you feel that you have some pricing power to, maybe not immediately, but certainly raise price over time?
Roger E. Susi - Founder, Chairman, CEO & President
The answer is yes. But I got to point out, I was a little proactive on that. And as I said, we had some pretty good increases that we started on about this time last year, and you're seeing the fruit of that, particularly in the monitor. As you saw, the average price that Matt quoted here, that has been pretty significant.
Scott Robert Henry - MD, Senior Research Analyst & Head of Pharmaceuticals Research
Okay, great. And then final question, maybe for Matt just to get him involved. The tax rate, should we still be thinking about kind of a 24%, 25% tax rate for the full year? It was certainly a little lower than that in the first quarter.
Matt Garner
Thereabouts. I mean for what we're looking at, we've got roughly a 23% for the full year.
Operator
(Operator Instructions) Our next question comes from the line of Lisa Stringer (sic) [Springer] of Singular Research.
Lisa Springer - Research Analyst
Roger, I was wondering if you can comment on -- in terms of the surge on monitor sales, in terms of customer segments, was there any particular group of customers that was driving that? Or was it kind of spread across your whole customer base?
Roger E. Susi - Founder, Chairman, CEO & President
The monitor, Lisa?
Lisa Springer - Research Analyst
Yes.
Roger E. Susi - Founder, Chairman, CEO & President
Yes. It's across the whole customer base. We find ourselves as these quarters have rolled along since we had launched the monitor, we're participating in larger and larger deals as well, so that's very encouraging. Meaning we're moving from selling maybe 1 or 2 monitors at a pop to 8, 10, 12. So it's pretty exciting.
Lisa Springer - Research Analyst
For sure. Okay. And have you seen any impact on your European sales from the Ukraine war?
Roger E. Susi - Founder, Chairman, CEO & President
Maybe too soon to tell if it's because of the Ukraine issues. But the European business is -- I'd have to say international has been a little sluggish. And as you noticed, we're -- we said we're kind of favorable from the mix being domestic a little bit stout.
I don't think that -- I don't -- I can't tell you if that's anything to do with hesitations in Europe from the Ukraine thing or not. But I guess it's probably a good question and a logical thing to think if -- but at this point, I don't have any reason to tell you yes or no.
Operator
Thank you. At this time, I'd like to turn the call back over to Roger Susi for any closing remarks. Sir?
Roger E. Susi - Founder, Chairman, CEO & President
Well, I'll wrap up the call by saying again how pleased I am with our Q1 results and with how well the business is operating. I continue to believe strongly that customers are realizing the value that our products bring, which shows in the high level of bookings that we achieved quarter-after-quarter here these last few quarters.
I guess I'd like to say that Chris will be here working through the rest of the month to help Matt and everyone through this transition, and he's going to be missed. But a man's got to do what he's got to do and as he sees fit, and we wish him well. We're off to a great start in 2022 and I look forward to speaking with you all again next quarter, so thank you very much.
Operator
Thank you. This concludes the call. You may now disconnect.