Note 4. Intangible Assets

The following represents the balance of the intangible assets at September 30, 2013:

(in thousands)	Gross Intangible Assets		Accumulated Amortization		Net Intangible Assets
Cinryze Product rights	$	521,000	$	103,024	$	417,976
Plenadren Product rights	65,899		12,066		53,833
Buccolam Product rights	6,559		1,367		5,192
Auralis Contract rights	9,350		3,186		6,164
Vancocin Intangibles	7,407		988		6,419
Total	$	610,215	$	120,631	$	489,584

The following represents the balance of the intangible assets at December 31, 2012:

(in thousands)	Gross Intangible Assets		Accumulated Amortization		Net Intangible Assets
Cinryze Product rights	$	521,000	$	87,394	$	433,606
Plenadren Product rights	65,136		7,048		58,088
Buccolam Product rights	6,566		876		5,690
Auralis Contract rights	9,360		2,531		6,829
Vancocin Intangibles	168,099		54,773		113,326
Total	$	770,161	$	152,622	$	617,539

Cinryze

In October 2008, Cinryze was approved by the FDA for routine prophylaxis against angioedema attacks in adolescent and adult patients with HAE. Because the treatment indication is directed at a small population in the United States, orphan drug status was awarded by the FDA and orphan drug exclusivity was granted on the date of approval. Orphan drug exclusivity awards market exclusivity for seven years. These seven years of exclusivity prevents another company from marketing a product with the same active ingredient as Cinryze for routine prophylaxis against angioedema attacks in adolescent and adult patients with HAE through October 2015. In addition, a biosimilar version of Cinryze could not rely on Cinryze data for approval before 2020 as a result of data protection provisions contained in the Affordable Health Care for America Act.

As of September 30, 2013, the carrying amount of this intangible asset is approximately $418.0 million. We are amortizing this asset over its estimated 25-year useful life, through October 2033, or 18 years beyond the orphan exclusivity period and 13 years beyond the data protection period for biosimilar versions.

Our estimate of the useful life of Cinryze was based primarily on the following four considerations: 1) the exclusivity period granted to Cinryze as a result of marketing approval by the FDA with orphan drug status; 2) the landscape subsequent to the exclusivity period and the ability of follow-on biologics (FOB) entrants to compete with Cinryze; 3) the financial projections of Cinryze for both the periods of exclusivity and periods following exclusivity; and 4) barrier to entry for potentially competitive products.

When determining the post exclusivity landscape for Cinryze we concluded that barriers to entry for competitors to Cinryze are greater than other traditional biologics. They include, but are not limited to the following. Cinryze treats a known population base of approximately 4,600 patients. HAE is generally thought to affect approximately 10,000 people in the United States, many of whom have not yet been diagnosed. Therefore the market upside for potential competitors is limited. The capital investment for a potential competitor to construct a manufacturing facility is prohibitive and would limit the number of participants willing to enter the prophylactic HAE market. In order to qualify for the abbreviated approval process for biosimilar versions of biologics licensed under full BLAs (“reference biologics”) a biosimilar applicant generally must submit analytical, animal, and clinical data showing that the proposed product is “highly similar” to the reference product and has no “clinically meaningful differences” from the reference product in terms of the safety, purity, and potency, although FDA may waive some or all of these requirements. FDA cannot license a biosimilar until 12 years after it first licensed the reference biologic. It is therefore likely that a biosimilar would have to conduct clinical trials to show that a FOB is highly similar to Cinryze and has no clinically meaningful differences. To conduct these trials, one must produce enough drug to sustain a trial and attract the required number of HAE patients to prove safety and efficacy comparable to Cinryze. Patients on Cinryze are those HAE patients who experience life threatening laryngeal attacks, or frequent attacks that inhibit their quality of life and/or ability to work. To obtain patients for a clinical trial, the FOB company will have to convince patients to stop taking this life saving drug and test a new unproven product. We believe that this would be met with great resistance from both patients and doctors and would limit the ability of a FOB company to perform clinical trials.

At present, one C1 inhibitor and several compounds have received approval from FDA for the acute indication with de minimus impact on the prophylactic market, primarily due to the payor environment. Though we might see competition at some point in the future, we believe it would be limited.

Based on the expected cash flows and value generated in the years following both the end of exclusivity and the potential entry of FOB competition, we concluded that an estimated useful life of 25 years for the Cinryze product rights was appropriate.

Vancocin

On April 9, 2012, the FDA denied the citizen petition we filed on March 17, 2006 related to the FDA’s proposed in vitro method for determining bioequivalence of generic versions of Vancocin (vancomycin hydrochloride, USP) capsules. The FDA also informed us in the same correspondence that the recent supplemental new drug application (sNDA) for Vancocin which was approved on December 14, 2011 would not qualify for three additional years of exclusivity, as the agency interpreted Section 505(v) of the FD&C Act to require a showing of a significant new use (such as a new indication) for an old antibiotic such as Vancocin in order for such old antibiotic to be eligible for a grant of exclusivity. FDA also indicated that it approved three abbreviated new drug applications (ANDAs) for generic vancomycin capsules and the companies holding these ANDA approvals indicated that they began shipping generic vancomycin hydrochloride, USP. In June 2012, the FDA approved a fourth ANDA for generic vancomycin capsules.

As a result of the actions of FDA, we performed step one of the impairment test in the first quarter of 2012 based on our current forecast (base case) of the impact of generics on our Vancocin and vancomycin cash flows. The sum of the undiscounted cash flows exceeded the carrying amount as of March 31, 2012 by approximately $210 million. During the third quarter of 2012, we experienced larger than anticipated erosion in the sales volume and net realizable price in the Vancocin branded market and the entrance of a fourth generic competitor which prompted us to determine it appropriate to perform the step one of the impairment test again as of September 30, 2012. The sum of the undiscounted cash flows exceeded the carrying amount as of September 30, 2012 by approximately $34 million.

In March 2013, the net price at which our authorized generic distributor sold generic vancomycin fell sharply due to pricing pressures in the generic marketplace. This significant decline caused us to test the recoverability of the Vancocin intangible asset. Step one of the impairment test failed and we performed a step two analysis. Under step two, we are required to reduce the carrying value of the intangible asset to its estimated fair value, and as a result have recorded an impairment of approximately $104.2 million reducing the carrying amount of the intangible assets to approximately $7.4 million at March 31, 2013. The fair value of the intangible asset was estimated using an income approach based on present value of the probability adjusted future cash flows. In determining the probability adjusted cash flows, we took into consideration the current and anticipated impact of the significant net price reduction that has occurred in the generic marketplace on both net sales of our authorized generic and sales of branded Vancocin. Based on the revised cash flow projections, the useful life of the asset was also reduced to 3.75 years from 16.75 years as of March 31, 2013 which represents the period over which we expect to receive substantially all of the net present value of the adjusted cash flows. Should future events occur that cause further reductions in revenue or operating results we would incur an additional impairment charge, which would be significant relative to the carrying value of the intangible assets as of September 30, 2013.

Auralis and Buccolam

On May 28, 2010, we acquired Auralis, a UK based specialty pharmaceutical company. With the acquisition of Auralis we added one marketed product and several development assets to our portfolio. We recognized an intangible asset related to certain supply agreements for the marketed product and one of the development assets. Additionally, we recognized in-process research and development (IPR&D) assets related to the development assets which were currently not approved. We determined that these assets meet the criterion for separate recognition as intangible assets and the fair value of these assets have been determined based upon discounted cash flow models. In 2011, the European Commission granted a Centralized PUMA for Buccolam, for treatment of prolonged, acute, convulsive seizures in infants, toddlers, children and adolescents, from 3 months to less than 18 years of age. This asset was previously classified as an IPR&D asset. As a result of this approval we began to amortize this asset over its estimated useful life of 10 years. The contract rights acquired are being amortized on a straight-line basis over their estimated useful lives of 12 years.

Plenadren

On November 15, 2011, we acquired DuoCort, a company focused on improving glucocorticoid replacement therapy for treatment of AI. The acquisition of DuoCort further expands our orphan disease commercial product portfolio. On November 3, 2011, the EC granted European Marketing Authorization for Plenadren® (hydrocortisone, modified release tablet), an orphan drug for treatment of adrenal insufficiency in adults, which will bring these patients their first pharmaceutical innovation in over 50 years. We recognized an intangible asset related to the Plenadren product rights. The product rights acquired are being amortized on a straight-line basis over their estimated useful lives of 10 years.