Kevin Sayer
Analyst · Piper Jaffray
Thank you, Terry. I'll start with a financial update. DexCom finished the year strong generating $20.9 million in product revenue for the fourth quarter of 2011 compared to $13.6 million for the same quarter in 2010, a 54% increase. Sequentially, product revenue for Q4 of 2011 increased 26% from the prior quarter. And year-over-year product revenue was up approximately 64% totaling $65.9 million for 2011 compared to $40.2 million in 2010. Total revenue for the fourth quarter was $22.4 million, compared to $15.6 million during the same quarter in 2010. Our product gross profit totaled $10.2 million generating gross margin of 49% for Q4 2011 compared to gross profit of $5.9 million and a gross margin of 44% for the same quarter in the prior year.
Sequentially, our product gross profit increased $2.8 million on increased sales of $4.3 million over the prior quarter and our gross margin increased 4 margin points over Q3. Year-over-year, product gross profit increased $15.2 million on increased sales of $25.7 million. Gross profit more than doubled from last year and our gross margin increased 9.4 margin points over 2010.
Research and development expense totaled $9.2 million for Q4 of 2011 compared to $6.9 million in Q4 of 2010 primarily a result of additional expenditures related to our future generation ambulatory products, primarily our Gen4 product. Sequentially R&D expense increased 12% which was primarily due to higher development clinical and regulatory costs, again relating to our future ambulatory products and primarily the Gen4 product.
We continue - we expect to continue to incur significant R&D expenses as we complete our Gen4 trial in Q1 and complete our PMA filing. Right after our Gen4 filing, we will commence the pediatric trial to enhance our labeling for children and these accounts fall [ph] in during the Q2, Q3 timeframe. We'll then shift our efforts to our Gen5 platform to enable communication with a smartphone and the Roche Tandem insulin pump products. After Q2, we expect things to stabilize a bit but on an overall basis, it will be a year of much activity and we expect R&D expenses for 2012 will increase some compared to fiscal 2011.
Selling, general and administrative expense totaled $13.7 million in Q4 of 2011 compared to $10.0 million during the same quarter in 2010. This increase which included $900,000 in additional share based compensation was primarily due to additional selling, information technology costs, and customer support costs to support revenue growth. We note, however the year-over-year SG&A growing 23%, our products revenues grew 64%. We're beginning to see some leverage on our SG&A infrastructure. Sequentially, SG&A expense increased 4% with the increase primarily due to additional selling costs, information technology and customer support costs to support our increased volumes. For full-year 2012 we expect cash based SG&A expenses to increase by less than 20% compared to the whole year 2011. As we continue to expand our marketing and product awareness campaigns, our IT infrastructure and support our revenue growth. Our net loss for the fourth quarter of 2011 totaled $12.3 million and included $5 million in non-cash expenses that are primarily in share based compensation. And the loss per share for the quarter was $0.18.
We ended the quarter with $83 million in cash, restricted cash and marketable securities and have working capital of $90 million. Our uses for cash during the fourth quarter can be characterized in 3 areas. First our Q4 CapEx was over $3.5 million as we are working rapidly to complete our clean room expansion and acquire the equipment necessary to ramp up manufacturing to support increased volumes for current and future generations of our technology. Second, we had a negative working capital swing of $4.4 million during Q4 with $3.5 million of this coming from receivables and the remainder coming from increases in inventory during the quarter. Finally, our cash operating loss was just over $7.3 million for the fourth quarter of 2011.
As we discussed on numerous occasions, the fourth quarter is typically the strongest of the year for companies in the durable medical equipment business. As annual deductibles had generally been met, meaning patients can obtain the product for little or no out of pocket expense. Our flexible spending account deadlines loom, so patients who participate in these employer sponsored programs must utilize any excess funds they save prior to year end. We attribute our strong performance during the fourth quarter, to typical Q4 seasonality as well as our stepped up efforts to increase awareness and demand for our CGM products. Just as a point of reference our Q4 product revenues exceeded our total revenues of 2009 by 16%. Obviously, our strong Q4 performance begs the question: What will our growth be in 2012?
As a remainder, at the J.P. Morgan Healthcare Conference in January, we issued guidance of estimated full-year 2012 product revenue ranging from $85 million to $92 million and we remain comfortable with that guidance. Now we do not plan to provide quarterly guidance going forward. I remind investors that the first quarter is traditionally a seasonally slow quarter in the durable medical equipment businesses and annual insurance deductibles reset and flexible spending accounts are largely unfunded. So I'll remind investors that within years past approximately 40% to 45% of our product revenues have been generated in the first half of the year and 55% to 60% have been generated in the second half.
We do not view 2012 any differently. Last year, Q1 accounted for approximately 20% of our annual revenue and we would expect similar performance in the first quarter of this year. I'll now provide you with the Gen4 update. Shifting to an update on our fourth quarter generation sensor system, I am pleased to report that we have successfully completed this pivotal trial for our fourth generation system and we are actively engaged in our data analysis. We expect to file PMA with the FDA by the end of this quarter or early in the second quarter. I am also pleased to report that we submitted our improved Gen4 configuration with our notified body to obtain CE Mark approval and expect to launch the Gen4 standalone system outside the United States during the summer of 2012.
Finally, a partnership update. Turning to our development partnerships in January, we announced that we entered into a development and commercialization agreement with Tandem Diabetes Care. We also have [ph] agreement with Roche under the terms of the Tandem agreement, Tandem will pay discount [ph] to technology license fee of $3 million. Tandem will offset our development, clinical, and regulatory expenses and commercialization of the combined system Tandem will pay discount $100 for each CGM enabled handheld sold. Further our patient-centric model we have adopted an open architecture strategy in order to provide our patients the ability to choose a pump system that best fits their needs.
We believe the financial framework established under the Roche agreement and married in our Tandem partnership is appropriate for both existing and potential future pump partners that wish to integrate our advanced CGM technologies into their product offerings. Animas continues to commercialize the Vibe system in Europe and is expected to increase the number of available markets over the course of the year. With regards to the filing of the PMA supplement for U.S. approval of the Vibe, we continue to anticipate filing with the FDA approximately 100 days after we file our Gen4 PMA.
Finally, the development of our second generation in-hospital glucose monitoring system conducted in collaboration with Edwards Lifesciences continues to move forward as Edwards mentioned in its Q4 earnings call the commercial launch of Gen2 in Europe is expected before year-end as we collectively work on several additional enhancements to that product. I would now like to turn the call back over to Terry for some concluding remarks.