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Operator
Good morning, ladies and gentlemen, and welcome to Supernus Pharmaceuticals' first-quarter 2015 earnings conference call. (Operator Instructions) As a reminder, this conference call is being recorded.
I would now like to turn the conference over to Peter Vozzo. Sir, you may begin.
Peter Vozzo - IR, Westwicke Partners
Thank you, Crystal. Good morning, everyone, and thank you for joining us today for Supernus Pharmaceuticals' 2015 first-quarter financial results conference call. Results discussed today are for the quarter ended March 31, 2015. Yesterday after the market closed, the Company issued a press release announcing these results.
On the call with me today are Supernus's Chief Executive Officer, Jack Khattar, and Chief Financial Officer, Greg Patrick. Today's call is being made available via the investor relations section of the Company's website at ir.supernus.com. Following remarks by management, we will open the call to questions. We expect the duration of the call to be approximately 45 minutes.
During the course of this call, management may make certain forward-looking statements regarding future events and the Company's future performance. These forward-looking statements reflect Supernus's current perspective on existing trends and information and can be identified by such words as expect, plan, will, may, anticipate, believe, should, intend, and other words of similar meaning.
Any such forward-looking statements are not guarantees of future performance and involve risks and uncertainties, including those noted in the risk factor section of our most recent annual report on Form 10-K. Actual results may differ materially from those projected in these forward-looking statements.
For the benefit of those of you who may be listening to the replay of this call being held and recorded on May 6, 2015, at approximately 9 a.m. Eastern Time, since then, the Company may have made additional announcements related to the topics discussed. Please reference the Company's most recent press releases and current filings with the SEC. Supernus declines any obligation to update these forward-looking statements, except as may be required by applicable securities laws.
I will now turn the call over to Jack.
Jack Khattar - President and CEO
Thank you, Peter, and good morning, everyone. I appreciate everyone taking the time to join us as we discuss our 2015 first-quarter results. I'm very excited about the continued solid growth in our business and our prospects moving forward.
Let me focus on some of the key highlights. Product prescription growth continued at a strong pace in the first quarter. Total prescriptions for the first quarter as reported by Symphony were 78,763, an increase of approximately 46,700 prescriptions or 146% over the first quarter of 2014 and an increase of approximately 8,024 prescriptions or 11% over the fourth quarter of 2014.
Trokendi XR prescriptions for first quarter totaled 57,663, which is an 187% increase over the 20,094 prescriptions for the first quarter of last year and a 14% increase over the 50,583 prescriptions for the fourth quarter of 2014. Oxtellar XR prescriptions for the first quarter totaled 21,100, representing an increase of 76% over the 11,969 prescriptions for the first quarter of 2014 and a 5% increase [over the] 20,156 prescriptions in the fourth quarter of 2014.
For the most recent month of March, we reached an all-time high in prescriptions for both Trokendi XR and Oxtellar XR. There were 21,112 prescriptions for Trokendi XR, a 14.3% growth over the previous monthly record of 18,466 prescriptions. And Oxtellar XR prescriptions reached 7,530 prescriptions, a 6.5% growth over the previous monthly record of 7,070 prescriptions.
Moreover, for the first four weeks of the second quarter of 2015, prescriptions for Trokendi XR and Oxtellar XR continue to be strong, with growth of 11.9% and 7.5%, respectively, compared to the first four weeks of the first quarter of 2015.
Finally, for the last few weeks, based on Symphony's last -- latest weekly prescription data, Trokendi XR became the number one branded topiramate product in the market, surpassing Topamax. Total net product sales for the first quarter of 2015 were $28.1 million compared to total net product sales of $9 million for the same quarter last year and $30.5 million for the fourth quarter of 2014.
As you can see, strong sequential quarter-to-quarter product prescription growth in the first quarter of 2015 was not fully reflected in first-quarter product sales growth, as inventory levels in the distribution channel fluctuated between the two quarters. We estimate that there was about a one-week shift in inventories that contributed to the slight sequential decline in sales.
Moving on to our pipeline, we continue to progress on schedule with our two pipeline candidates. First, on SPN-810, as previously stated, we plan to initiate Phase III clinical testing during the fourth quarter of 2015.
In early April, we submitted to the FDA the impulsive aggression outcomes and assessment scale that will be used in those trials. We are targeting to meet with the FDA early in the third quarter of this year to review the scale and the request for a Special Protocol Assessment.
For SPN-812, which is a novel treatment for ADHD, we submitted an investigational new drug application for the extended release formulation to the FDA and remain on track to start a Phase IIb trial during the fourth quarter of this year. This trial will be a dose range finding study in pediatrics, designed to establish safety and efficacy in ADHD.
Also I want to remind everyone that we will be hosting an investor day event in New York City on June 17 of this year, when we will share with you an overview of our Company, including a detailed discussion of our clinical programs and an assessment of the market potential of these products. If you haven't responded yet and would like to attend, please email Supernus at westwicke -- with an e at the end-- dotcom so we can include you in the event.
With that, I will now turn it over to Greg to walk you through the financial results.
Greg Patrick - CFO
Thanks, Jack. And good morning, everyone. As I review our financial results, I like to remind our listeners to refer to the first-quarter 2015 earnings press release issued yesterday after the market closed. We expect to file our report on Form 10-Q for the quarter ended March 31, 2015, later this week.
Total revenue for the first quarter of 2015 was $28.1 million compared to total revenue of $30.8 million in the fourth quarter of 2014. Total revenue for both products was comprised almost exclusively of net product sales.
Net product sales for the first quarter of 2015 was comprised of $20.9 million for Trokendi XR and $7.2 million for Oxtellar XR. These results compare to $22.9 million for Trokendi XR and $7.6 million for Oxtellar XR in the fourth quarter of 2014.
As Jack previously described in his comments, strong sequential quarter-to-quarter product prescription growth in the first quarter of 2015 was not fully reflected in growth of reported first-quarter product sales. It's important to note that when selling our products through wholesalers and pharmacies, changes in their ordering patterns and inventory levels will impact our reported sales.
These changes may not be directly related to underlying prescription demand for our products and are not within our control. In particular, during the fourth quarter of 2014, inventory at wholesalers was approximately three weeks of supply or approximately one week higher than prior periods. During the first quarter of 2015, wholesaler inventories decreased to an estimated two weeks of supply, which is at the lower end of inventory levels for our products.
Had weeks of supply through the fourth quarter of 2014 and first quarter of 2015 remained constant at two weeks of supply, total net product sales would have been $28.5 million in the fourth quarter of 2014 and $30 million in the first quarter of 2015. It is important to note that for the last 12 months, our product inventory levels at wholesalers have consistently remained at industry norm levels, ranging from approximately 2 to 4 weeks of demand.
Product gross margin for the quarter was 94.2%. Research and development expenses were $3.7 million during the first quarter of 2015 and $4.5 million in the same period the prior year. This decrease is due to the completion of SPN-812 clinical trials in 2014.
Going forward, we expect research and development expenses to increase significantly during 2015, as clinical development and manufacturing scale-up activities associated with SPN-810 and SPN-812 ramp up throughout the year. We expect that R&D expenses will vary quarter to quarter, reflecting the normal ramp-up of late stage clinical and manufacturing trial activities.
Selling, general, and administrative expenses were $19.4 million for the first quarter of 2015 as compared to $17.5 million in the same period in 2014. Higher expense in 2015 reflects a full quarter's impact of the expansion of the sales force that occurred in early 2014, coupled with increased promotional and marketing activities to support the expanded sales force. For the first quarter, operating income totaled $3.4 million as compared to an operating loss of $13.4 million in the first quarter of 2014.
Net income for the first quarter was $0.9 million or $0.02 per diluted share as compared to a net loss of $15.5 million or $0.38 per diluted share in the first quarter of 2014. This year-over-year improvement in operating income and net income is driven primarily by increased product revenue associated with higher volumes from Trokendi XR and Oxtellar XR.
Approximately 44.9 million weighted average diluted common shares were outstanding in first quarter of 2015 as compared to 41.1 million shares in the first quarter of 2014. As of March 31, 2015, we had $92.2 million in cash, cash equivalents, marketable securities, and long-term marketable securities as compared to $94.2 million at December 31, 2014.
Cash flow for operations was positive in the first quarter of 2015, offset by approximately $2.5 million of legal fees associated with patent defense. As of March 31, 2015, approximately $14.7 million or 16% of our 6-year $90 million convertible notes remained outstanding. As of May 5, 2015, approximately $13.5 million of convertible notes remained outstanding.
For full year 2015, we reiterate that we expect net product sales will grow by approximately 15% from 2014, ranging from $130 million to $140 million. We continue to expect operating income to range from $6 million to $10 million, driven by continued growth in product sales from both Trokendi XR and Oxtellar XR, partially offset by growth in research and development expenses.
We are providing full-year 2015 research and development expense guidance for the first time today. We estimate R&D expense to increase by over 50% in 2015 compared to 2014, as the Company accelerates the development of SPN-810 and SPN-812.
We reiterate full-year 2015 operating income of $6 million to $10 million. We would like to remind everyone that we continue to expect quarterly operating income to vary during 2015, depending on the quarterly variability and research and development spending.
I would now turn to call back to the operator for questions.
Operator
(Operator Instructions)
David Amsellem, Piper Jaffray.
David Amsellem - Analyst
Thanks. Just a couple of quick ones. First, just on the inventory, can you just walk us through how we should think about the right range going forward should be in terms of the number of weeks for both products? And then secondly, can you talk about how we should think about the gross to net on both products going forward?
And then lastly, this is sort of an expense question -- and I may have missed this, since I joined late. But you talk about that R&D spend being up quite significantly this year over last year, but just walk us through the timing of that ramp in spend, given that, at least in this quarter -- at least in the first quarter, R&D was pretty light. So maybe just talk about directionally how we should think about R&D for the rest of the quarters this year? Thanks.
Jack Khattar - President and CEO
Hi, David. This is Jack. I'll take the first question and maybe Greg can take the other couple questions. On the inventories -- the important thing here to note is that throughout even 2014 and the last 12 months, as Greg mentioned, our inventories are within the 2 to 4 weeks. We see it fluctuate all the time -- every month, every quarter, depending on the ordering patterns of wholesalers.
But it's a very, very comfortable range that we believe these products we can handle, although we have seen recently very spotty out-of-stock situations in certain pharmacies reported to us. So we try to watch it very carefully. If anything, we tend to be more on the lower end of that range, but I think two to four weeks is a very comfortable level of inventory for both products.
Typically, Oxtellar XR tends to be a little bit higher in that range versus Trokendi XR, just by the nature of the fact that it's a much smaller product and the demand is not as probably steady, consistent, or as large as it is with Trokendi XR.
As far as the gross to net, I'll let Greg handle that.
Greg Patrick - CFO
Right. Hi, David. Gross to net for Trokendi XR, we continue to see in the mid-to upper $20s million. And we'd expect that to progressively grow as we progress through 2015.
Oxtellar XR, because of the heavier Medicaid footprint for that product, is in the upper $30s million right now. And again, as similar to Trokendi XR, we expect that to also grow as we progress over the year.
With respect to R&D spending, R&D spending for the first quarter was a bit light, certainly, as you compare it to 2014. The reason for the year-over-year decline is that several trials for SPN-810 actually wrapped up in early 2014 and we don't have those going on this year.
In terms of spending going forward, we did say in our last call and reiterated in this call that we expect R&D spending to be up over 50% year over year. So that would place it kind of at the mid-$30s million -- let's say $35 million, $36 million. And we expect that to be pretty much evenly spread over the next 3 quarters.
So as we see scale-up activities to support clinical trials, to support registration validation activities, those are expensive and we expect our clinical trial activities to kick into gear in a serious way going forward in the second and third quarters. I would expect research spending to be, just by simple math, north of $10 million each of those quarters.
David Amsellem - Analyst
Okay. That's helpful. If I may sneak in a quick follow-up, can you just remind us what the Medicaid mix is in terms of the portion of volumes for both Oxtellar and Trokendi?
Greg Patrick - CFO
Yes. Sure. So Trokendi XR in the low teens -- I would say 10% to 12% of the patient population. Oxtellar XR in the mid-20%s -- so 25% to 27%.
David Amsellem - Analyst
Okay. Thank you.
Operator
Ken Cacciatore, Cowen.
Unidentified Participant - Analyst
This is Sal in for Ken. Just a quick question on the balance sheet. So now with the convertible notes down to roughly $13 million, can you just comment on your ability to leverage and use your balance sheet in 2015? And just want to get a just status update on where litigation stands for Trokendi and Oxtellar XR?
Greg Patrick - CFO
Okay. So I'll field the first question and asked Jack to fill the second one. So in terms of leveraging our balance sheet, clearly with the convertible notes continuing to be brought forward for redemption and the levels that we are looking at right now, we continue to be bound by the covenants in our convert agreement, which -- that I think that probably the one which would be the most restrictive was to EBITDA multiple.
With our EBITDA starting to mount, we have got the ability to raise a certain amount of money, although, as we've said in the past -- as I have said in the past -- if we wanted to raise serious money to do a transaction, it would probably involve taking out or somehow removing the existing convertible debt. That's clearly the most -- in a straightforward way to do that, rather than function under the EBITDA restrictions, which are, by the way, a 12-month rolling average.
In terms of litigation clause, let me turn the question back to Jack.
Jack Khattar - President and CEO
Regarding Oxtellar XR, which is obviously the case is more progressed than Trokendi XR, just because of the timing. We passed the Markman hearing at this point, so that ruling happened. The depositions on witnesses and so forth, that also has occurred. The 30-month expiration date for the process is really the end of December of 2015 and we don't have a trial date yet for Oxtellar XR.
So we probably would expect it to be somewhere maybe in the fourth quarter, but really, you don't know until the judge sets a date for the trial. So that's where we are on Oxtellar XR.
Trokendi XR, as I mentioned, is a little bit earlier in the process. So we are moving forward with the [total to] Markman hearing maybe sometime around the end of this year, potential.
Unidentified Participant - Analyst
Thanks, guys.
Operator
Annabel Samimy, Stifel.
Annabel Samimy - Analyst
Hi. Thanks for taking my question. Just a follow-up on David's question regarding the Medicaid composition. Did you say that Oxtellar -- the percentages that you gave for Oxtellar and Trokendi -- that's overall -- that's for those specific products or is that just in general oxcarb and topiramate?
Greg Patrick - CFO
No, that's for our product. So the percentages I referenced for is the percentage that we are actually seeing in terms of Medicaid reporting for each quarter.
Annabel Samimy - Analyst
Okay. And do you have a sense of what that might grow to -- what Medicaid composition is of epilepsy drugs overall?
Jack Khattar - President and CEO
Annabel, they tend to mimic actually the markets. They are not far off from. So if you look at the oxcarbazepine market, it is the same range of 25% to 26% or 27%. So to your question, we don't see a reason why Oxtellar XR should be higher than that or lower than it, so it's really trending now in line with the market, the oxcarbazepine market.
And similarly with Trokendi XR. If you look at the topiramate market, again, the Medicaid portion tends to be in the low teens -- 12%, 13%. And as Greg said, our Trokendi XR is in the 10% to 12%. So if it gets any higher, it shouldn't go that much higher. We are at the range at this point.
Annabel Samimy - Analyst
Okay. Great. That's helpful. And on the inventory shift, we understand that there is shifts all throughout the year. Is the one between fourth quarter and first quarter, though, typically more exaggerated than the rest of the year? It seems to be a trend in the pharma industry. I just want to see if that's what you are seeing.
Jack Khattar - President and CEO
Yes. We actually even saw a very similar thing back in December 2013 and early 2014 -- about a one-week shift. You can't predict exactly. We watch it very, very carefully -- wholesaler withdrawals against shipments.
We monitor this very carefully and we've seen a very, very similar pattern. Now probably a year and a year ago, with everything that was going on with us with the revenue recognition and so forth, it didn't really pop up as much as it popped up in this quarter.
But we just wanted to be transparent, as we always have been. And it's only a week shift, so it's really within the industry norms and averages of how these wholesalers behave sometimes. Before year end, maybe they expect people to take price increases -- whatever behind that behavior, but that's how it is.
Annabel Samimy - Analyst
Okay. And just to follow through on business developments -- someone has to ask the question, of course. So obviously, everyone is seeking a lot of assets right now and I think we can say there's a number of companies in the spec pharma space looking at [C&F] assets.
So can you just talk about the competitive environment and the pricing environment that you are seeing right now? If your priority is still to seek additional assets to bridge the gap between your pipeline and your portfolio right now?
Jack Khattar - President and CEO
Yes, the answers to both questions is yes. First, we continue to look for opportunities. It is a priority for the Company. We are active on several fronts and seeking assets that strategically fit with our footprint and that really is in line with the success that we've had so far with Oxtellar XR and Trokendi XR.
And absolutely, you would expect. And it is competitive out there. That's why you actually see some of the pricing that occurs on some of these assets and how much people are bidding up some of these assets that are available and they're going after.
But as we reiterated before, we try to be very, very disciplined in our approach to these kind of things. We have this as a priority, but it's not that we are desperate to do something. There is a difference between the two.
And therefore, we tend to be more disciplined in what we look for and what we pay for and how much we are willing to pay for certain things. It has to make sense at the end of the day, without diluting our shareholder capital just to acquire something just for the sake of acquiring it. So -- but it is a priority and we continue to be very active in that space, absolutely.
Annabel Samimy - Analyst
Okay. If I can follow up with one more question. Are there any other -- obviously, Trokendi and Oxtellar are growing very nicely. Are there any other programs that you feel you need to put in place to perpetuate that growth or make any additional investments in those programs?
Jack Khattar - President and CEO
We continue to promote the products very heavily and aggressively from a sales force point of view as well as from a marketing stand point of view. The market out there is competitive. There are a lot of numerous companies in the epilepsy space, if you look at it today, who are actually promoting or in neurologist office, so we want to clearly make sure we maintain our share of voice or even increase our share of voice, so we are always out there continuing to promote both products.
Again, as many of you may recall, we've said that many times that this space is very promotion-sensitive. These products, you really have to be always in front of the neurologist, reminding them of the benefits of the extended release formulations on both of the products so that that switch is always happening when the patient and the opportunity presents itself.
So we will continue to do that. These are still very early stage growth products for us. So absolutely we will continue to promote them so that we can get the maximum potential.
And again, we believe the maximum potential of both products is in the $500 million range. As you look at the topiramate molecule, which is now closing in on about 13 million prescription on an annual basis, even the oxcarbazepine molecule is growing and has been growing for the last two years since we launched oxcarbazepine.
And we haven't even scratched the surface as far as penetration. So there is only plenty of growth for us to really be able to benefit from these two markets.
Annabel Samimy - Analyst
Okay. Great. Thank you.
Operator
Thank you. And I would now like to turn to call back over to management for any closing remarks.
Jack Khattar - President and CEO
Thanks for joining us this morning. I would like to summarize by saying that Supernus continues to execute across all areas of its business. We continue to be focused on maximizing the potential of Trokendi XR and Oxtellar XR, giving more patients the opportunity to better manage their epilepsy condition.
As we mentioned before, we continue to believe that the two products combined have the potential for peak sales of $500 million or more. In addition, we are focused on advancing SPN-810 and SPN-812 in clinical trials. And very much look forward to seeing you on June 17 at our investor day event in New York City. Thank you.
Operator
Ladies and gentlemen, thank you for participating in today's conference. This does conclude the program and you may all disconnect. Everyone have a wonderful day.