Thank you, Tim, and good morning, everyone. Revenues for the fourth quarter of 2011 were $1.4 million as compared to $1.3 million for the corresponding period in 2010. The $0.1 million increase in revenue was primarily attributable to the receipt of $0.8 million from a licensing of patent technology related to Insmed's CISPLATIN Lipid Complex, which is partially offset by year-over-year decrease in $0.7 million in cost recovery from Insmed's IPLEX Expanded Access Program in Europe, which ended in early December 2011. I'd like to note here that given the EAP has now ended, Insmed will no longer receive IPLEX-related cost recovery revenue going forward.
Revenues for the year ended December 31, 2011, totaled $4.4 million as compared to $6.9 million for the year ended December 31, 2010. The $2.5 million decrease was also primarily due to a year-over-year decrease of $3.5 million in cost recovery from the IPLEX EAP in Europe, partially offset by $1 million in license fees received in 2011 for the out-licensing of patent technology related to Insmed's CISPLATIN Lipid Complex.
Net loss for the quarter was $8.2 million or $0.33 per share as compared to a net loss of $5.8 million or $0.42 per share in the fourth quarter of 2010. The $2.4 million variance arose from a $2.7 million increase in total expenses and includes a $1.2 million noncash charge related to the write-down of the Richmond office lease, following the closure of the office in December 2011 when the IPLEX EAP activity ceased. This was partially offset by the $0.1 million increase in revenues. The higher expenses related primarily to the increased clinical and manufacturing costs associated with our ARIKACE development program, while the $1.2 million noncash charge resulted from the write-down of the lease on the Richmond, Virginia office.
Net loss attributable to common stockholders for the year ended December 31, 2011, was $68.8 million or $2.95 per basic and diluted common share compared to a net loss of $6.4 million or $0.49 per basic and diluted common share for the year ended December 31, 2010. The net loss attributable to common stockholders in 2011 includes a $1.2 million noncash charge discussed earlier. It also includes a noncash $9.2 million accounting charge from earlier in the year regarding the beneficial conversion feature of the Series B conditional convertible preferred stock, as well as a $26 million noncash charge for impairment of goodwill, and in process, R&D from Q3 2011 due to the material impact of the clinical hold on our ARIKACE development program.
The accounting charge for the beneficial conversion feature, or BCF, of the Series B preferred stock is detailed in the press release and is being explained fully in our prior earnings calls. The impairment charge was taken in Q3 2011 and reflects the analysis undertaken at the time to measure the impact to the clinical hold on the carrying value of our goodwill and IP R&D. These 2 items are purely accounting adjustments and, as a reminder, have no impact on cash.
R&D expenses increased to $6.5 million in the 2011 fourth quarter from $2.5 million in the year-ago period. The increase of $4 million is attributable to the activities on our ARIKACE program, including the preparation for the initiation of our ARIKACE clinical studies and the manufacturing of supply to support the studies. Specifically, clinical development and regulatory expenses increased $3.4 million for the 3 months ending December 31, 2011, in support of the planning efforts for ARIKACE, and clinical manufacturing expenses increased $0.7 million when compared to the same period in 2010.
Research and development expenses increased to $27.9 million in the year ended December 31, 2011, from $4.8 million in the year ended December 31, 2010. The increase of $23.1 million in 2011 is also attributable to the clinical research and development of the ARIKACE program and the manufacturing of supply to support the studies in 2011.
Of note, within the R&D expenses, clinical development and regulatory expenses increased $15.4 million in 2011 compared to 2010, as a result of the planning efforts for the ARIKACE studies prior to the FDA clinical hold placed on our U.S. CF and NTM studies and pending the potential FDA lifting of the clinical hold. As you are aware, the clinical hold in CF remains in place. There was also a $4.5 million increase in clinical manufacturing expenses in 2011 attributable to the manufacturing of ARIKACE for use in these studies. While compensation expenses rose $3.2 million due to an increased headcount of 17 year-on-year to 28.
Turning to general and administrative. Those expenses were $3.8 million in the fourth quarter of 2011, down from $5.2 million in the year-ago period. The $1.4 million increase was largely due to the nonrecurring, external finance, legal and consulting expenses related to do business combination with Transave in the fourth quarter of 2010, which were partially offset by the Richmond office closure costs and increased headcount expenses in the current quarter in support of the ARIKACE development program.
For the year ended December 31, 2011, G&A expenses increased to $12.2 million from $10.3 million for the year ended December 31, 2010. The $1.9 million increase was due largely to the charge related to the Richmond office closure, headcount increases and nonrecurring business combination costs as discussed earlier.
Moving to investment income. This increased $0.2 million to $0.6 million for the fourth quarter when compared to the same period last year. For the year ended December 31, 2011, investment income increased by $0.3 million to $2 million as compared to the prior year period. The increase is a result of improved returns on our short-term investments. The reduction in interest expense for the 12-month period ended December 31, 2011, as compared to the same period in 2010 was entirely due to the elimination of convertible notes, which were fully repaid in March 2010.
As of December 31, 2011, Insmed had total cash, cash equivalents, short-term investments and certificate of deposits on hand of $78.4 million, consisting of $76.3 million in cash and short-term investments and $2.1 million in a certificate of deposits as compared to $110.2 million of cash on hand as of December 31, 2010. The $31.8 million decrease in total cash was primarily due to the net cash used in operating activities, which totaled $30.2 million during the 2001 fiscal year -- 2011 fiscal year, sorry. The $78.4 million in cash on hand is above our previous guidance of $72 million to $75 million as we continued with our commitment in the quarter of maintaining financial discipline.
Looking ahead, we will continue to be prudent with our cash spend as we look to focus on maintaining our cost discipline and preservation of capital while advancing our clinical programs. Based on the 3 key ARIKACE clinical studies and the 9-month inhalation dog toxicity study that Tim discussed earlier, we expect to end fiscal 2012 year with a cash position of $40 million to $44 million. We believe this forecasted cash position will take us through the availability of top line data for the NTM Phase II clinical trial and the European Phase III CF study and is based on the information we currently have to date.
With that, I would now like to pass the call back over to the operator for any questions.