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Operator
Welcome to the IRadimed Corporation Second Quarter 2022 Financial Results Conference Call. (Operator Instructions) As a reminder, this call is being recorded today, July 29, 2022, and contains time-sensitive information that is accurate only as of today.
Earlier, IRadimed released its financial results for the second 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 press release copy 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 the -- iradimed.com, and a replay of the call will be available on the website for the next 90 days.
Some of the information 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 the 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 may be obtained for free from the SEC's website at sec.gov.
I would 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
Thank you, operator. Good morning, and thank you for joining us on the call. I'm very happy to report that IRadimed has had yet another excellent quarter of revenue and earnings growth as reported in this morning's release, which unfortunately, I must add, was earlier only on the SEC site and not in the broader news sources until just minutes ago, as there was as -- an as-of-yet unknown issue with the service used for disseminating our filings broadly.
As mentioned in our earlier release, this was our top revenue quarter ever and the third in a string of our strongest-growth quarters. And I'll add that the trend of strong demand for our products remains very much intact, and thus, we feel very good about the coming quarters as well.
As reported, our second quarter revenue was $12.7 million, nearly a 30% increase over the second quarter of last year. Non-GAAP earnings were $0.26 or 116% over Q2 2021. I'm very pleased with these results and the hard efforts of our team. With 0.5 years behind us and growing at record levels, we look forward to achieving our guidance for the year.
Though supply risks are very much with us on a near-daily basis, the team has succeeded in finding ways to prevail, and we feel that measures put in place these last months will continue to help us mitigate supply risks. Our sales team continues to perform well, increasingly driving customer demand for our products, with total Q2 bookings continuing to reach record levels, once again coming in higher than shipments for the quarter.
Additionally, the strong backlog provides great visibility and affords us the ability to maneuver and reallocate resources as supply issues may arise. Sales are well balanced and strong from both the pump and monitor product lines with excitement and interest growing for the new FMD product as well.
Our engineering and regulatory teams continue to work extremely hard, responding to FDA to clear their questions and obtain 510(k) clearance for our next-generation IV pump, the MRidium 3870. A large written response will be filed in August. And from there, we expect to hear from FDA in September or October and learn the next steps.
Assuming this FDA reply will be straightforward, the team will next turn their efforts towards obtaining CE Mark for the 3870, allowing sales into EU countries. Though with economic conditions in Europe as they currently are and with the euro having broken the buck, the business opportunities there are expected to be weak for some time.
Regarding our new ferromagnetic detection system. We finished producing a small number of systems just at the end of the quarter. And along with an additional backlog of 12 units currently being prepared, we plan to report revenue for all these units in the upcoming Q3. As I said earlier, interest is building, and we expect the order rate to continue increasing in Q3.
Regarding our financial guidance. With our current bookings trend and with the added visibility we have through a growing backlog, we believe we are well on track to attain the goals we have guided towards as well as our ability to continue growth at these record levels.
We are reiterating our guidance for the full 2022 revenue of $52.5 million to $53.2 million, GAAP earnings of $0.89 to $0.95 and non-GAAP earnings of $0.96 to $1.03. Additionally, for the third quarter this year, we expect revenue of $13.1 million to $13.3 million with GAAP earnings of $0.21 to $0.24 and non-GAAP earnings of $0.22 to $0.25.
Now I'll turn the call over to our new CFO, Jack Glenn, to introduce himself and review the financial results for the quarter. Jack is reaching out to us from home is he is suffering a bit from COVID. But as a strong CFO would do, he's on the phone with us today.
So Jack, please.
John F. Glenn - CFO
Thank you, Roger, and good morning, everyone. Before summarizing the financial results for the quarter, I would like to take a moment to introduce myself. My career as the CFO has spanned over 25 years with most of that time spent in the medical device industry. IRadimed is my fifth public company as CFO, and I am thankful and excited to work with Roger and the IRadimed team to drive future growth and success.
Now on to the financial summary. As in the past, our results are reported on a GAAP basis and non-GAAP basis. You can find a description of our non-GAAP operating measures in this morning's earnings release and a reconciliation of these non-GAAP measures to the GAAP measure on the last page of today's release.
As we reported earlier this morning, revenue in the second quarter of 2022 was $12.7 million, an increase of 29.7% compared to the second quarter of 2021. Revenue from domestic sales increased 34.5% to $10.8 million and revenue from international sales increased 7.8% to $1.9 million. Overall, domestic revenue accounted for 85% of total revenue for Q2 2022 compared to 82% for Q2 of 2021.
Device revenue increased 50.4% to $8.8 million. This was driven by a 45.7% increase in monitor revenue, resulting from continued strong execution by our sales team on the conversion of the sales opportunity pipeline.
The average selling price of our MRI-compatible IV infusion pump system during the second quarter of 2022 was approximately $37,400 compared to approximately $41,600 for the second quarter of 2021. This decrease relates to higher international unit sales and an unfavorable product sales mix compared to the same period in 2021.
The average selling price of our MRI-compatible patient vital signs monitoring system during the second quarter of 2022, was approximately $48,700 compared to approximately $39,700 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 services decreased 1.7% to $3.4 million for the second quarter of 2022, while revenue from our maintenance contracts was consistent at $0.5 million for both periods.
The gross margin was 79.7% for the 2022 quarter compared to 74.7% for the 2021 quarter. The increase in gross margin percent is primarily due to maintaining a price increase implemented during the second half of 2021 and higher domestic sales compared to the same period in 2021.
While the supply chain remains challenging, we believe any negative impact from higher cost will likely be limited and partially offset by higher unit production levels, resulting in gross margins consistent with our historical ranges.
Operating expenses were $6 million or 47% of revenue compared to $5.5 million or approximately 55.9% of revenue for the second quarter of 2021. On a dollar basis, this increase is primarily due to higher sales commissions and sales activity as well as higher research and development expenses related to the next-generation pump, offset by reduced legal and professional fees.
As a result, income from operations grew 126% to $4.2 million for the 2022 quarter.
We recognized a tax expense during the second quarter of 2022 of approximately $939,000, resulting in an effective tax rate of 22.5% compared to a tax expense of approximately $388,000 in the 2021 quarter. This increase is due to higher sales -- higher taxable income, partially offset by benefits associated with stock-based compensation and research and development credits.
On a GAAP basis, net income was $0.26 per share compared to $0.12 for the 2021 quarter. On a non-GAAP basis, adjusted income was $0.26 per diluted share for the 2022 quarter compared to $0.14 for the second quarter of 2021. Cash from operations was $3.1 million for the 6 months ended June 30, 2022, down from $4.5 million for the same period in 2021. This decrease was primarily due to increased accounts receivable on the higher sales volume. For the 3 months ended June 30, 2022, and 2021, our free cash flow, a non-GAAP measure, was $1.5 million and $3.5 million, respectively.
And with that, now -- I will now turn the call over for questions. Operator?
Operator
(Operator Instructions) Our first question comes from Scott Henry with ROTH Capital Partners.
Scott Robert Henry - MD, Senior Research Analyst & Head of Pharmaceuticals Research
Just a couple of questions. First, on the FMD, it sounds like, if I heard correctly, there should be at least 12 units sold in Q3. Could you talk about -- how much should -- how should we think about revenue per unit for that product?
Roger E. Susi - Founder, Chairman, CEO & President
Yes, Scott, this is Roger. Maybe I'll take that first. So the initial ones, I suppose, are being sold with pricing that we're feeling our way through. These have been at the upper $20,000 area, $27,000, $28,000. So that's what you'll probably see for the initial couple of quarters as we get our toes in this water, right? And from there, I hope, as you've seen what we've done with the pumps and the monitors, that we get a little bit of uplift in our ASPs as time goes on and the market conditions show us that we're on track with the right product.
Scott Robert Henry - MD, Senior Research Analyst & Head of Pharmaceuticals Research
Okay. Great. And then for clarity, I know you said you would expect to hear from the FDA in kind of September, October on that next-generation pump. I mean, would you -- obviously, you would prefer final approval at that time. But do you think there's also potential for more correspondence? Or how should we think about what could happen in that time frame?
Roger E. Susi - Founder, Chairman, CEO & President
Well, there's always a little more correspondence. Even when they're preparing the final release, that generally takes a whole month with just some back-and-forth finishing touches to the final letter. So that would be great.
We don't know how much capacity the FDA has right at this moment in time, though. We keep our eye on this group that does IV pumps, and they are rather shorthanded. So that will probably impact how fast they can work on anything in that IV pump group as well. We have no idea how to gauge that at this point. We'll see.
Scott Robert Henry - MD, Senior Research Analyst & Head of Pharmaceuticals Research
Okay. Great. It sounds like we'll just think about Q4, and then hopefully comes in at some point during Q4, that final approval.
Shifting to the model. Spending was sort of down across all categories in Q2 versus Q1. I guess Q1 was a strong spending quarter. In general, were there any trends there? Or would you just look at that as a variation from quarter-to-quarter? And any trends there?
Roger E. Susi - Founder, Chairman, CEO & President
Do you want to take that one, Jack?
John F. Glenn - CFO
Yes, sure, sure. I would say, Scott, that yes, there's some variability between the quarters, but our spend is pretty much in line with what we've been forecasting. There's been an increase on the sales side, obviously, there's been increase in our sales activities and our sales force. And then any of the increase in the spend on R&D will be tied to the efforts on the next-generation pump that we're working on.
But the G&A side is pretty stable. There was a little bit of a decline in some of our legal and professional expense.
Scott Robert Henry - MD, Senior Research Analyst & Head of Pharmaceuticals Research
Okay. And then the final question, just on gross margins. You talked a little bit about it on the prepared remarks. But my takeaway was, and I want to see if I heard this correctly, Q2 was very strong. And it sounds like going forward, gross margins are in fact getting stronger, but perhaps not quite as strong as Q2 would indicate. Is that the way I should think about that?
John F. Glenn - CFO
Yes. I think that Q2 was -- go ahead, Roger. Sorry.
Roger E. Susi - Founder, Chairman, CEO & President
Go ahead, Jack.
John F. Glenn - CFO
Sorry. I was just going to add to it that, yes, I think there that Q2 kind of stood out a little bit, a little above the historical. But some of that was due to the product mix. As we mentioned, our ASPs have been holding very steady. The other thing to note would be, I think, that as we -- the higher sales volume, we're absorbing more in our overhead from the fixed overhead standpoint. So that certainly helps. But I think in that historical range is kind of where we see it going forward.
Operator
(Operator Instructions) And I'm not showing any further questions at this time. I would now like to turn the call back over to Roger Susi for any further remarks.
Roger E. Susi - Founder, Chairman, CEO & President
Thank you. Again, it's with great pleasure that we report our record growth, especially in light of today's economic upheavals. Your company is running very efficiently and its products are being adopted at an accelerating rate. Our sales force is growing, and you will see that expansion plans to meet growth are being developed and in fact currently in initial stages of implementation.
With that, I look forward to reporting our future success as the year progresses. And thank you all.
Operator
Thank you. This concludes today's conference call. Thank you for participating. You may now disconnect.