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Operator
Welcome to the Collegium Pharmaceutical's Second Quarter 2017 Earnings Conference Call. Before we begin today's call, we wish to inform participants that the forward-looking statements made today are pursuant to the safe harbor provision of the Private Securities Litigation Reform Act of 1995. You are cautioned that such forward-looking statements involve risks and uncertainties, including and without limitation, the risk that we will not be able to successfully commercialize for Xtampza. Furthermore, we are subject to patent infringement litigation and may in the future be subject to additional litigation relating to our other product candidates, which may be expensive to defend and delay the commercialization of Xtampza or our other product candidates. These risks and other risks of the company are detailed from time to time in the company's periodic reports filed with the Securities and Exchange Commission. Our future results may differ materially from our current expectations discussed today.
I will now turn the call over to Collegium CEO, Mike Heffernan.
Michael T. Heffernan - Founder, Chairman, CEO, President, Treasurer and Secretary
Thank you. Good afternoon, and welcome to the second quarter Collegium earnings call. This is Mike Heffernan, and I'm joined today by Paul Brannelly, our CFO; and Joe Ciaffoni, our recently appointed Chief Operating Officer.
We intend to provide additional insight into our recent progress in our second quarter financial results. Today, with our earnings release, we announced the addition of Gwen Melincoff to our Board of Directors. Gwen is an experienced pharmaceutical executive with expertise in both commercial and corporate development functions. She will be an excellent resource as we strive to build Collegium into a leading specialty pharmaceutical company focused in providing safer pain management options.
Also, we announced in May that we had hired Joe Ciaffoni as the newly -- in a newly created role of Chief Operating Officer. Joe comes to Collegium with significant commercial and operational experience, including recently heading the global specialty medicines group at Biogen. He has spent his first 2 months at Collegium focused on the commercial organization, and he will provide additional insights in a few minutes.
Overall, we are encouraged by our continued growth of Xtampza ER in the second quarter. After a short period, early in the quarter of flat week-over-week prescriptions, we are pleased by the recent accelerated growth over the last half of the quarter. This is fueled by a number of executional adjustments and recent managed care wins that are starting to produce the desired results. We finished the quarter with 18,600 prescriptions versus 13,800 in the first quarter and have now generated close to 40,000 prescriptions written by over 4,000 prescribers since the Xtampza launch.
In addition to our commercial progress, which Joe will outline in more detail shortly, there are a number of other milestones in the quarter. Since the beginning of the year, we have received notice of allowance or been issued 3 additional patents that are all orange book listable, and will extend out the patent exclusivity period of Xtampza to 2036 and will bring to the number of 12, the total number of patents listed in the Orange book for Xtampza.
On the product development side, we have made additional progress on our second extended release opioid candidate, incorporating the DETERx technology and have recently completed manufacturing of clinical trial material for our DETERx Hydrocodone candidate.
In the third quarter, we will be initiating the next step of the clinical development program with this candidate. We're also completing manufacturing of registration batches of ONSOLIS at the new manufacturing facility and have progressed commercial planning activities. Our goal is the end of the year FDA filing of a prior approval supplement and a planned product launch for mid-2018. We have also continued to invest in the clinical differentiation of Xtampza ER versus its competitors by completing studies and publishing data that demonstrate and reinforce that all abuse deterrent products are not the same and further highlight the advantages of the DETERx technology.
A recently completed study that was accepted for peer-reviewed publication, tested the in vitro release after crushing Xtampza ER versus 8 commonly prescribed extended release opioid formulations, including OxyContin. The study results demonstrated that Xtampza ER is significantly more resistant to crushing than all other formulations that were tested and further supports the fact that Xtampza ER is the only ER opioid that doesn't have a box warning regarding the potential dangers of not taking the product intact. We will continue to invest in both clinical and nonclinical studies to highlight the advantage of Xtampza ER with the goal of continuing to distinguish it as the best-in-class abuse deterrent opioid.
We will also be increasing our efforts to influence policymakers and payers on a need to include abuse deterrent opioids as part of a comprehensive solution for addressing opioid abuse, misuse and diversion as well as encouraging payers to eliminate fail first policies which require patients to fail a nonabuse-deterrent opioid prior to getting approval for an opioid with abuse-deterrent features. Failing a nonabuse-deterrent opioid has the potential for severe consequences that can be readily avoided by providing a treatment option that has the best abuse-deterrent properties.
I'll now turn over the discussion to Joe Ciaffoni to provide additional detail on the commercial performance.
Joseph J. Ciaffoni - COO & Executive VP
Thanks, Mike. I'm excited to be at Collegium, an organization created and striving every day to make a positive difference in the lives of people living with chronic pain and in the communities that it serves.
In my brief couple of months with the organization, I've been impressed by the team's experience, confidence and accomplishments. Collegium's belief in the DETERx technology and passion for the important role that Xtampza ER can play in the treatment of patients with chronic pain has been energizing.
The organization's commitment starting from the top to keep the patient first while operating with integrity has been well-established. Over the past several weeks, I've also had the opportunity to interact with a significant number of customers, including physicians, pharmacists and payers. All stakeholders recognize the need for efficacious and potentially safer treatment options.
I was encouraged by the receptivity to Xtampza ER's value proposition and the recognition that abuse-deterrent formulations are not all the same. The experience of physicians that have prescribed Xtampza ER, pharmacies that have it on their shelves and payers that have added it to their formularies has been positive.
In the second quarter, progress was made in a multitude of areas. Noteworthy accomplishments include: Total prescriptions up 34% Q2 versus Q1; Xtampza ER is now the fastest-growing established branded ER opioid. The number of new prescribers increased 22% versus Q1 with the addition of over 1,100 new prescribers. The number of prescriptions per prescriber increased too.
New Part D formulary wins that took effect in Q2 had a positive impact on performance. The team's efforts in removing nonclinical barriers had impact as paid rates in commercial plans improved to 83% and in Part D to 77%, reflecting Xtampza ER's overall broad availability.
Lastly, the team executed a retail field force expansion growing from 118 to 131 territories. Upon joining Collegium, I conducted immersion sessions with the commercial functions: Sales, marketing, managed care and operations, along with medical affairs. During these sessions, we reviewed the opioid market and Collegium strategies, tactics, people and processes. The key outputs are an aligned view on the organization's strengths, opportunities for improvement and the path forward.
For the remainder of 2017, the Collegium team will be laser-focused on generating momentum through operational execution. The field force is our biggest investment. Thus, field force execution is our highest priority. Although significant progress has been made launch-to-date, unaided awareness of Xtampza ER remains relatively low and represents an opportunity for improvement. Call quality and effective delivery of the Xtampza ER core messages is key to success.
Coverage of our target audience of approximately 10,000 predominantly pain management specialists is critical to maximizing the potential of Xtampza ER. In spite of the headwinds impacting the overall ER opioid market, primary care physicians, in particular, the ER opioid prescribing of our target audience remains relatively flat.
Maximizing our broad managed care access and recent wins at Aetna D, Humana D and Blue Cross Blue Shield of Florida is a top priority. Xtampza ER is now covered on the 2 largest PBMs too. The decision to withdraw OPANA ER from the market reinforces that abuse-deterrent formulations are not the same, which creates a positioning opportunity for Xtampza ER and a conversion opportunity as chronic pain patients and their physicians are forced to seek a replacement medication. The Collegium team has mobilized in a focused and responsible manner to ensure that Xtampza ER is considered for appropriate patients. Concurrently, the organization is taking actions to ensure that we're prepared to accelerate Xtampza ER in 2018.
Key acceleration actions include: Developing a new promotional campaign and stronger messaging to establish Xtampza ER as the oxycodone ER of choice; securing new formulary wins and strengthening existing formulary positions where possible; leveraging learnings to-date to determine the optimal marketing mix; and improving key processes and systems to enable stronger execution. I am confident that a strong focus on operational execution will enable us to generate momentum through the remainder of 2017 while taking the necessary actions to ensure that we're positioned to accelerate Xtampza ER in 2018.
I look forward to working with the team to make this happen. I will now turn the call over to Paul to discuss our second quarter financial results.
Paul Brannelly - CFO and EVP
Thanks, Joe. Good afternoon, everyone. For the second quarter of 2017, our net loss was $21.1 million compared to $24.5 million for the second quarter of 2016, resulting in a net loss per share of $0.72 and $1.05 for 2017 and '16 quarters, respectively.
The decrease in our net loss is primarily due to the net product revenue for Xtampza. In the second quarter, we recorded net product revenue of $3.6 million. As discussed on previous calls, we currently recognize revenue based on the sell-through model.
During the quarter, we shipped $10.8 million of Xtampza to wholesalers and now have $10.4 million of deferred revenue on our balance sheet. Deferred revenue represents gross shipments to wholesalers that haven't been recognized as revenue. On average, wholesalers now have under 20 days of inventory on hand.
During the second quarter, our gross net discount was 52.2%, an improvement from 58.7% during the first quarter of 2017. For the full year 2017, we estimate that our gross-to-net discount will be in the range of 50% as the impact of our co-pay card programs decrease and prescriptions increase with noncontracted and lower rebated payers.
As of June 30, our cash balance was $111.2 million. During the second quarter, cash used by operating activities was $17.5 million, which decreased by $6.2 million from the first quarter of 2017. Based on current operating plans, we believe that our existing cash resources, together with expected cash inflows from the commercialization of Xtampza, are sufficient to fund our operations into 2019.
I will now turn the call back over to Mike Heffernan
Michael T. Heffernan - Founder, Chairman, CEO, President, Treasurer and Secretary
Thanks, Paul. I'll now open it up to questions.
Operator
(Operator Instructions) Our first question comes from the line of David Amsellem with Piper Jaffray.
David A. Amsellem - MD and Senior Research Analyst
So just a couple. First, in terms of the volume growth. Can you talk about how much of the growth that you saw in the back part of the -- or back half of the quarter, was driven by all of the hoopla around OPANA ER and was that, you think, a meaningful boost? And then, secondly, regarding the payer landscape. Can you talk about big Part D contracts that are still out there that you think could be added and could impact the business either the back half of this year or next year?
Joseph J. Ciaffoni - COO & Executive VP
David, this is Joe. Thank you for the question. First off, with regards to the second quarter trends and the uptick that we saw, I don't think that I would accredit or ascribe that to OPANA ER and that communication. I would really put it on the shoulders of stronger execution, the team continuing to get experienced stability within the field force focusing in on the key messages and really improved execution. That being said, we are starting to see that we're capturing a market share greater than what we currently have with regards to OPANA ER. So as that event gets closer and continues to evolve, our expectation is that we'll see that contribute more to the momentum that we're seeing. But in the second quarter, I think it was more about execution. To your second question with regards to managed care wins, where it is? We're negotiating and trying to get additional access. That's not something that we're going to comment on, on the call. Thanks for the question.
Operator
Our next question comes from Tim Lugo with William Blair.
Timothy Francis Lugo - Co-Group Head of Biopharma Equity Research & Partner
A few. What's the current status of the United Health's, I guess, just state of affairs? I know that there's some disruptions in Q1. And also, for your final 505 B2 Hydrocodone product, which product will you reference against?
Joseph J. Ciaffoni - COO & Executive VP
So Tim, this is Joe. I'll take the UHC question. UHC, we're very encouraged by what it is we're seeing. To give you a frame of reference, at the end of 2016 at UHC, we had low single-digit market share. At the end of the first quarter in UHC, we were around 20%. Now we believe we're in the mid-20s and we're approaching market leadership within the ER branded opioid bucket. So we feel we have the right focus. It's a good example and a good demonstration of what it is that we can do from a pull-through perspective. And as we move forward to the back half of the year with the strong position we have, we also think we'll have additional opportunity as OPANA ER comes off the marketplace.
Michael T. Heffernan - Founder, Chairman, CEO, President, Treasurer and Secretary
And this is Mike, Tim, I'll take the second question regarding our DETERx Hydrocodone candidate. Our product's intended to be a twice a day product. That's our target. We have not decided and/or disclosed what the actual reference will be when it comes to our 505 B2 position. As I'm sure you're aware, each one has a regulatory and a legal consideration. And so from a strategic standpoint, we won't unlike -- we will likely not disclose that.
Timothy Francis Lugo - Co-Group Head of Biopharma Equity Research & Partner
Okay. And quickly for Hydrocodone, you mentioned the next steps for the program. Is that -- is the next step going to be a pivotal trial or a dose ranging trial?
Michael T. Heffernan - Founder, Chairman, CEO, President, Treasurer and Secretary
Yes, the next step, the intent of the next step is to finalize our selection of formulation to understand its abuse-deterrent qualities, understand its bioavailability versus the different reference choices we have, to see what our options are as we continue to develop.
Operator
Our next question comes from Ken Trbovich with Janney.
Kenneth Eugene Trbovich - Director of Specialty Pharmaceuticals
Michael, I was wondering if you might be able to give us an update just with regard to the industry outlook in terms of trying to get parity with payers in terms of state legislation or even proposed federal legislation because it certainly seems that payers are the major obstacle here. And nobody seems to talk about that in the late press when it comes to the issue of abuse-deterrents and trying to resolve some of those problems.
Michael T. Heffernan - Founder, Chairman, CEO, President, Treasurer and Secretary
Yes, I mean, the -- yes, there continues to be state-by-state discussion and legislation that's both filed and approved around ADF opioids and making sure that there's equal playing field. As you are I'm sure aware in Massachusetts, for example, there's a law that went into effect where once it's finally implemented, will require that ADF opioids are substituted -- are actually substitute products that don't have ADF qualities. And there's a formulary being developed around it. That's probably one of the more aggressive plans. But in other states, there's additional conversation. The thing that we are focused on is making sure that ADF opioids are offered, not after a fail first policy. And so we spent a lot of time on the policy side talking about that. We are very encouraged by some of the recent comments by Dr. Gottlieb, our new FDA commissioner. He recently said that he wanted to make sure that ADF opioids will have a growing role in clinical practice since we believe they're safer for individual patients. They also went on to say that they look forward to a market where ADF opioids are the predominant products. So we think that all things are moving in the right direction. But it's going to be a while, we think, until there's a mandate. There's a lot of pushback. And we all have seen the ICER report, for example, and some of the other headwinds. There's pushback against cost. But the interesting thing to us is that when you really look at the data, including the ICER report, I think there's a clear recognition that ADF opioids decrease abuse and misuse and diversion. And it's an important piece of the overall solution to the opioid crisis.
Kenneth Eugene Trbovich - Director of Specialty Pharmaceuticals
And then, I guess, just as a quick follow-up. Can you give us a sense as to sort of the relative importance now of the sNDA and the label change that you're seeking, knowing that you're able or have at least started the promotional efforts using the literature that's been published? Can you kind of walk us through the importance of that as we look forward to that PDUFA date later this year?
Michael T. Heffernan - Founder, Chairman, CEO, President, Treasurer and Secretary
Yes. So as you know, we talked about the -- the PDUFA date is in the beginning of November. And that sNDA will include data on direct head-to-head data versus OxyContin. It also includes data on our recently completed human abuse potential study for all abuse. Both of those pieces of information would enhance our label and I think just really solidify the fact that this product is different than other products on the market, including OxyContin. So it is important to us. But as noted, we are able to talk about the characteristic difference between Xtampza and OxyContin at this point in time. This would just accelerate and strengthen that conversation.
Kenneth Eugene Trbovich - Director of Specialty Pharmaceuticals
Okay. And then one last question for Paul. Just trying to better understand the sort of anticipated pattern now for shipments. I know you mentioned that there's less than 20 days inventory on hand after shipping almost 11 million in the quarter. Is there some level that you think they reached where the deferred revenue starts a get worked down? Or do you anticipate that they're going to continue to build inventory as the volumes increase?
Paul Brannelly - CFO and EVP
So I think that's about as low as they should go on -- for inventory on hand. But our revenue recognition right now is based on sell-through methods. So it's on scripts. So we continue to evaluate when's the appropriate time to reevaluate that revenue recognition policy and potentially start recognizing revenue like most companies do on the selling method.
Kenneth Eugene Trbovich - Director of Specialty Pharmaceuticals
Got it. But we're not there yet. I take it from your commentary, it doesn't sound like a 2017 event.
Paul Brannelly - CFO and EVP
So, it could be. We're evaluating that. And a year into the launch, we start to accumulate the data necessary to make some estimates that prevent you from doing the selling method at launch.
Kenneth Eugene Trbovich - Director of Specialty Pharmaceuticals
Got it. And do you anticipate that we would have some sort of heads up on that? Or is that just something that you guys won't do and then we'll see the deferred sort of change at that point in time?
Paul Brannelly - CFO and EVP
Yes. So there's a disclosure in our 10-Q that was filed in the last half hour as well that we're actively evaluating when's the right time to switch to sell in.
Operator
Our next question comes from Serge Belanger with Needham & Company.
Serge D. Belanger - Senior Analyst
A couple of questions for me. First one for Joe. You kind of talked about this in your prepared remarks about a dichotomy in opioid prescribing between primary care physicians and the pain specialists. And I think one of your competitors this week hinted at that and decided to kind of pull their call efforts towards the primary care segment. So just wanted your thoughts on what you're seeing with Xtampza and what actions you're taking to address that.
Joseph J. Ciaffoni - COO & Executive VP
Okay. Serge, thanks for the question. Our call audience, as I said in my comments, is 10,000, roughly, physicians that are pain management specialists predominantly. And we're very confident that, that's the right place to be focused because when you look at the prescription dynamic, where you see significant decline in the primary care segment because of things like CDC guidelines and the other factors, the cohort of physicians we're focused on, they're prescribing in the ER branded opioid space, is stable. So we're very confident in the physician group that we're focused on. And our efforts are about really honing in on execution. I referenced that one of the opportunities we have is there's relatively low awareness of Xtampza ER right now in the marketplace. And a key differentiator between the group who prescribed the product and those who don't, one driver is awareness. A second thing that is really important is their understanding and the better they understand it, the more they believe in the differentiation of the DETERx technology. That gives them the wherewithal to either push the product through the payer landscape, if necessary, or to put the patient on the product. And that's the formula that we see leading to the growth that we're seeing and what will put us on a path of continued and accelerated growth. Thanks for the question.
Serge D. Belanger - Senior Analyst
And then you mentioned a couple of steps you plan on undertaking into '18 to further drive Xtampza growth. Are you comfortable, at this point, with the amount of sales reps? And I guess, you mentioned better formulary positioning of Xtampza. What are the barriers to that? Is it just pricing or better awareness of the product?
Joseph J. Ciaffoni - COO & Executive VP
Yes. So to your first question, Serge, I'm confident in the size of our field force. I think we're sized correctly. I also, being relatively new to the organization, was pleased to see how we're resourced. I think we're resourced to accomplish our objectives with Xtampza ER. And I think it's important, for the remainder of this year, that we're really sharply focused on operational execution, inclusive of managed care pull through. We are also in a fair amount of negotiations. And I'm confident, as we come down the stretch of this year and as we move into 2018, we will both secure new formulary wins and we will strengthen our position within existing formularies where we've already won. I think the dynamic that's most important in the discussions we're having with the payers is when they believe and understand the DETERx technology and the impact that it can have on patients with chronic pain, that's where we start every discussion we have, whether it's with physicians, payers, pharmacists because that's really the thing that then drives them to want to get into the other discussions. And I think you've seen in our track record, when we do that, we can secure formulary positions. And importantly, we're now able to bring to them examples like a UnitedHealthcare, that when you do put us on formulary, the market will respond and we can move share. So thanks for the question.
Operator
(Operator Instructions) Our next question comes from the line of Kevin Kedra with Gabelli.
Kevin Kedra - Research Analyst
First, I know Xtampza is a -- I've used the term formulation. But there are other elements of the formulation that kind of differentiate it from some of the products you mentioned. It's the only one that doesn't have that black box warning about crushing. So just wondering if those other features of the product have allowed you to get any traction with Xtampza. And then, secondly, we've seen a significant repricing of the value of assets within the pain space and particularly, the opioid space. How are you thinking about potential business development opportunities and possibly adding a couple or adding additional assets to your sales force?
Joseph J. Ciaffoni - COO & Executive VP
So Kevin, I'll take the first question with regards to the things that drive utilization of Xtampza ER. And when you look at the data, one, the DETERx technology, when it's well understood, is very compelling. I think it's not a primary driver of utilization, but the alternative ways of which Xtampza can be administered in certain settings is important. There's 2 things in the market research and when we're sitting with prescribers that are really important to them being motivated to utilize Xtampza ER. One, and it's the magnitude of their belief and concern around abuse, misuse and diversion. So physicians that are really concerned, aware of and on top of, that topic have a higher likelihood of writing Xtampza than those who are aware of it, but don't have that same magnitude of concern. The second thing is the threshold of efficacy, which is an easy one for us to get over because we're oxycodone and they're comfortable with the base molecule. And then it gets to a fundamental belief of the magnitude of belief of the differentiation of the DETERx technology. And when they believe and have a concern around abuse, misuse and diversion, and they see this technology as a significant step forward, those are the physicians that are then motivated to write a lot of Xtampza ER. And that's where our focus on increasing awareness of the product with the strong share of voice we have and then really being sharp on our messaging to differentiate is so important, and that's where our focus is.
Michael T. Heffernan - Founder, Chairman, CEO, President, Treasurer and Secretary
And Kevin, this is Mike. I'll take the second question on our BD strategy. Our focus in business development is really to expand the footprint of Xtampza internationally. And number two, to leverage our current integrated commercial infrastructure. As you know, we have a retail sales organization. We have a long-term care sales organization. We have a hospital sales organization. Our goal is to be a leader in pain management and provide solutions across the whole continuum of pain. And we're doing that with Xtampza and then the launch of ONSOLIS mid-next year, which is for breakthrough cancer pain. So we are actively evaluating assets and opportunities to bring safer pain management solutions to that continuum. We're very interested in the hospital marketplace and things such as post-op pain and so on. So we are very active in our evaluation process right now and the main goal is to leverage the current commercial infrastructure.
Operator
We have a follow-up question from the line of Kenneth Trbovich with Janney.
Kenneth Eugene Trbovich - Director of Specialty Pharmaceuticals
Joe, I was wondering if you could address maybe the uptake in long-term care in the hospital market. I know we spent a lot of time talking about retail scripts, but somewhat difficult to track for us how it's going in that side from what little we can see. Obviously, it looks like there's uptick there. But I was hoping you might be able to give us some greater clarity on how things are progressing.
Joseph J. Ciaffoni - COO & Executive VP
Yes, sure, Ken, I appreciate the question. So on hospital and LTC for the quarter, like we've seen with retail, we see continued progression, which is encouraging. As you know, those are different and longer sales cycles, in particular, in the institutions. So we've been encouraged with some of the formulary wins that we've been able to achieve along with some contracting at an IBM level, which gives us an opportunity to pull through. So we're seeing progress. It's a longer sales cycle. And the total picture today, it's a small contributor to our overall sales, but it's 2 channels where we believe it's important for us to be in for some of the reasons Mike referenced and we think over time and as we work through the sales cycle, it will continue to pick up and contribute to the overall success of Xtampza.
Kenneth Eugene Trbovich - Director of Specialty Pharmaceuticals
And is the leading message there different in the sense that back to the point about the black box as the only one that you don't have to worry about crushing simply from a safety standpoint. Is the message lead different there than it is in that physician setting in a doctor's office or a pain specialist's office?
Joseph J. Ciaffoni - COO & Executive VP
I think the message is similar. But when you get to the alternative administration in those settings, it dials up more than it does to an office space pain specialist. But the notion to whether it's the institution, whether it's in an LTC, the more the people making those decisions are concerned about abuse, misuse, diversion beyond the patient and others who can touch the product and the more they understand and believe that the DETERx technology is differentiated, that gives them the core receptivity to make a decision to add it to the formulary or to use it in any of the settings of which we're trying to drive utilization.
Operator
I'm not showing any further questions in queue at this time. I'd like to turn the call back to Mr. Heffernan for any closing remarks.
Michael T. Heffernan - Founder, Chairman, CEO, President, Treasurer and Secretary
Thank you, everyone, for joining the call today. And I'd like to thank the Collegium team for their continued dedication. We look forward to providing additional updates as the year continues to progress. Thank you very much.
Operator
Ladies and gentlemen, thank you for your participation in today's conference. This concludes the program and you may now disconnect. Everyone, have a great day.