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Operator
Welcome to the IRadimed Corporation Third Quarter 2022 Financial Results Conference Call. (Operator Instructions) As a reminder, the call is being recorded today, November 3, 2022, and contain sensitive information that is accurate only today.
Earlier, IRadimed released its financial results for the third 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 iradimed.com, and a replay of the call will be available on the website for the next 90 days.
Some of the information in today's session will constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements focus on 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 the 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 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, please go ahead.
Roger E. Susi - Founder, Chairman, CEO & President
Thank you, operator. Good morning, and thank you for joining us on the call, everyone. Today, I am again having the pleasant task of reporting that IRadimed has had yet another excellent quarter of revenue and earnings growth as we reported in this morning's release.
Q3 2022 has been our top revenue quarter ever and the third in a string of our strongest growth quarters. Further, I'll interject here that the strong growing demand for our products remains intact, which gives us confidence in the coming quarters that we will also -- and gives me much more to be proud of there in the future.
As reported in this morning's release, third quarter revenue was $13.4 million, a 23% increase over the third quarter last year. GAAP diluted earnings per share were $0.27 or 35% above the third quarter 2021. I'm very pleased with these results and the hard efforts of our team.
With 3 quarters behind us and growing at record levels, we look forward to achieving our guidance for the year. Though supply risks are still very much a concern, the team has succeeded in finding ways to prevail. And we feel that measures put in place these past several months will continue to help mitigate supply risk.
Our sales team continues to perform exceptionally well, increasing driving -- increasingly driving customer demand for our products. The total Q3 bookings reached record levels, again, coming in higher than shipments for the quarter, thus boosting backlog yet again to an even more comfortable level.
Additionally, strong backlog provides excellent visibility and it allows us to maneuver and reallocate resources as supply issues may arise. Sales growth was well balanced and strong for both the pump and the monitor product lines with an increasingly -- increasing number of the new FMD products shipping as well this quarter.
As discussed last quarter, we did file a very large written response to the FDA covering nearly 250 information questions related to the 510(k) process of the new 3870 IV pump. Though the FDA did engage to clear these questions, we had several e-mail follow-up for questions as well.
As the remaining time on FDA's 90-day total working time clock approached the last 4 days, we received a call indicating that they would not likely finish. This left us with little choice but to withdraw voluntarily and start a new application process. The FDA did indicate that should we voluntarily withdraw, they would engage with much greater numbers of direct dialogue calls as we prepared for resubmission. They indicated they too desire getting this 510(k) cleared with greater speed through better understanding and minimal confusion, which a direct dialogue should facilitate.
They also committed to providing a more explanation of the issues which had been remaining along with any new questions in writing so that these can be addressed as well before a resubmission. The first such meeting was held last week, and we are encouraged that these calls will indeed lead to a clear and complete 510(k) for resubmission and ultimately a cleared 3870 IV pump without repeat of lapse of time.
Now regarding our financial guidance, for the fourth quarter of 2022, our prior revenue guide remains unchanged. We expect to report revenue of $14.1 million to $14.8 million and a full year revenue of $52.5 million to $53.2 million. We are also increasing our earnings guidance as we expect to report for the fourth quarter GAAP diluted earnings per share of $0.23 to $0.28 and non-GAAP diluted earnings per share of $0.25 to $0.30. These amounts would result in full year GAAP diluted earnings per share of $0.95 to $1, and non-GAAP diluted earnings per share of $1.03 to $1.08.
Now I'd like to turn the call over to our new CFO, Jack Glenn, to review the financial results for the quarter.
John F. Glenn - CFO
Thank you, Roger, and good morning, everyone. As in the past, our results are reported on a GAAP basis and a 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 third quarter of 2022 was $13.4 million, an increase of 23% compared to third quarter of 2021. Domestic sales increased 24.6% to $10.8 million and international sales increased 16.4% to $2.6 million. Overall, domestic revenue accounted for 80.6% of total revenue for Q3 2022 compared to 79.6% for Q3 2021. Device revenue increased 32.2% to $9.4 million. This was driven by a 46% increase in monitor revenue as our sales team continued to execute and gain market share in the monitoring business.
The average selling price of our MRI compatible IV infusion pump system during the third quarter of 2022 was approximately $30,000 compared to approximately $33,000 for the third 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 third quarter of 2022, with approximately $46,000 compared to approximately $41,000 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 increased 5.3% to $3.4 million for the third quarter of 2022, while our maintenance contracts were consistent at $0.5 million for both periods. The gross margin was 78.6% for the 2022 quarter compared to 77.1% 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, along with our ability to offset any higher input costs through higher unit production levels spread over our fixed overhead costs.
Operating expenses were $6.4 million or 47.8% of revenue compared to $5.3 million or 48.6% of revenue for the third quarter of 2021. On a dollar basis, this increase is primarily due to higher sales commissions and sales activities, higher general and administrative expenses for additional headcount and higher legal and professional expenses. As a result, income from operations grew 32% to $4.1 million for the 2022 quarter.
We recognized the tax expense during the third quarter of 2022 of approximately $810,000, resulting in an effective tax rate of 19.1% compared to a tax expense of approximately $518,000 in the 2021 quarter. This increase is due to higher taxable income, partially offset by benefits associated with foreign-derived intangible income and research and development credits.
On a GAAP basis, net income was $0.27 per diluted share compared to $0.21 for the 2021 quarter. On a non-GAAP basis, adjusted income was $0.29 per diluted share for the 2022 quarter compared to $0.23 for the second quarter of 2021.
Cash from operations was $3.9 million for the 3 months ended September 30, 2022, up from $3.4 million for the same period in 2021. For the 3 months ended September 30, 2022 and 2021, our free cash flow and non-GAAP measure was $3.4 million and $3.2 million, respectively.
And with that, I will now turn the call over for questions. Operator?
Roger E. Susi - Founder, Chairman, CEO & President
Well, with that, I'd like to make one last point regarding our expansion plans. Along the growth comes a need for increased physical operations. And we have very recently placed a large parcel under contract where we will build what will be the first phase of a new facility. The target move in time is expected to be sometime in late 2024. And we plan this first phase to be almost 3x our current size, which, by that time, will be greatly needed as our revenue continues strong growth.
Finally, I reiterate our great pleasure reporting record growth, especially in light of today's economic tribulations to world over. With that, I would look forward to reporting our future success as 2022 ends and on into 2023. Thank you all.