In 2006, the Company entered into a collaboration agreement with Janssen Pharmaceutica, N.V. ("Janssen") for the development, manufacture and commercialization of telaprevir, which Janssen began marketing under the brand name INCIVO™ in certain of its territories outside of the United States in September 2011. Under the collaboration agreement, Janssen agreed to be responsible for 50% of the drug development costs incurred under the development program for the parties' territories (North America for the Company, and the rest of the world, other than the Far East, for Janssen) and has exclusive rights to commercialize telaprevir in its territories including Europe, South America, the Middle East, Africa and Australia.

Janssen pays the Company a tiered royalty averaging in the mid-20% range, subject to adjustment for generic competition, as a percentage of net sales of INCIVO in Janssen's territories. Janssen is required pursuant to the agreement to use diligent efforts to maximize net sales of INCIVO in its territories through its commercial marketing, pricing and contracting strategies. In addition, Janssen is responsible for certain third-party royalties on net sales of INCIVO in its territories.

Janssen made a $165.0 million up-front license payment to the Company in 2006. The up-front license payment is being amortized over the Company's estimated period of performance under the collaboration agreement. As of March 31, 2012, there were $52.8 million in deferred revenues related to this up-front license payment that the Company expects to recognize over the remaining estimated period of performance.

Under the agreement, Janssen agreed to make contingent milestone payments for successful development, approval and launch of telaprevir as a product in its territories. At the inception of the agreement, the Company determined that all of these contingent milestones were substantive and would result in revenues in the period in which the milestone was achieved. The Company has earned $350.0 million of these contingent milestone payments, including a $50.0 million milestone payment earned in the first quarter of 2011 in connection with the European Medicines Agency's ("EMA") acceptance of the marketing authorization application ("MAA") for INCIVO. The Company does not expect to receive any further milestone payments pursuant to this agreement.

Under the collaboration agreement for telaprevir, each party incurs internal and external reimbursable expenses related to the telaprevir development program and is reimbursed for 50% of these expenses. The Company recognizes the full amount of the reimbursable costs it incurs as research and development expenses on its condensed consolidated statements of operations. The Company recognizes the amounts that Janssen is obligated to pay the Company with respect to reimbursable expenses net of reimbursable expenses incurred by Janssen as collaborative revenues. In the first quarters of 2012 and 2011, Janssen incurred more reimbursable costs than the Company, and the net amounts payable by the Company to reimburse Janssen for expenses were recorded as a reduction of collaborative revenues.

Each of the parties is responsible for drug supply in their respective territories. The Company provides Janssen certain services through the Company's third-party manufacturing network for telaprevir. Reimbursements from Janssen for manufacturing services are recorded as collaborative revenues.

Janssen may terminate the agreement upon the later of (i) one year's advance notice and (ii) such period as may be required to assign and transfer to the Company specified filings and approvals. The agreement also may be terminated by either party for a material breach by the other, subject to notice and cure provisions. Unless earlier terminated, the agreement will continue in effect until the expiration of Janssen's royalty obligations, which expire on a country-by-country basis with the last-to-expire patent covering telaprevir. In the European Union, the Company has a patent covering the composition-of-matter of telaprevir that expires in 2021 and expects to obtain extensions to the term of this patent through 2026.

During the three months ended March 31, 2012 and 2011, the Company recognized the following revenues attributable to the Janssen collaboration:

	Three Months Ended March 31,

	2012			2011
	(in thousands)
Royalty revenues	$	32,884		$	—

Collaborative revenues:
Amortized portion of up-front payment	$	3,107		$	3,107
Milestone revenues		—			50,000
Net payment for telaprevir development costs		(1,139	)		(1,145	)
Reimbursement for manufacturing services		4,449			4,154

Total collaborative revenues attributable to the Janssen collaboration	$	6,417		$	56,116

Total revenues attributable to the Janssen collaboration	$	39,301		$	56,116

The Company has a collaboration agreement (the "MTPC Agreement") with Mitsubishi Tanabe Pharma Corporation ("Mitsubishi Tanabe") pursuant to which Mitsubishi Tanabe has a fully-paid license to manufacture and commercialize TELAVIC™ (the brand name under which Mitsubishi Tanabe is marketing telaprevir) to treat hepatitis C virus ("HCV") infection in Japan and specified other countries in the Far East. In September 2011, Mitsubishi Tanabe obtained approval to market TELAVIC in Japan.

The MTPC Agreement was entered into in 2004 and amended in 2009. Pursuant to the MTPC Agreement, Mitsubishi Tanabe provided financial and other support for the development and commercialization of telaprevir, made a $105.0 million payment in connection with the 2009 amendment of the collaboration agreement and made a $65.0 million commercial milestone payment in the fourth quarter of 2011 related to the commercialization of TELAVIC in Japan. There are no further milestone payments under this collaboration agreement. Mitsubishi Tanabe is responsible for its own development and manufacturing costs in its territory.

Mitsubishi Tanabe may terminate the MTPC Agreement at any time without cause upon 60 days' prior written notice to the Company. The MTPC Agreement also may be terminated by either party for a material breach by the other, subject to notice and cure provisions. Unless earlier terminated, the MTPC Agreement will continue in effect until the expiration of the last-to-expire patent covering telaprevir. In Japan, the Company has a patent covering the composition-of-matter of telaprevir that expires in 2021.

The $105.0 million payment that the Company received in the third quarter of 2009 in connection with the amendment is a nonrefundable, up-front license fee, and revenues related to this payment are being recognized on a straight-line basis over the expected period of performance of the Company's obligations under the amended agreement. As of March 31, 2012, there were $3.2 million in deferred revenues remaining related to this up-front license payment that will be recognized in the second quarter of 2012. In connection with the amendment to the MTPC Agreement, the Company agreed to supply manufacturing services to Mitsubishi Tanabe, until April 2012, through the Company's third-party manufacturing network for telaprevir.

During the three months ended March 31, 2012 and 2011, the Company recognized the following collaborative revenues attributable to the Mitsubishi Tanabe collaboration:

	Three Months Ended March 31,

	2012		2011
	(in thousands)
Amortized portion of up-front payments	$	9,558	$	9,558
Milestone revenues		485		1,212
Payments for manufacturing services		3,991		715

Total collaborative revenues attributable to the Mitsubishi Tanabe collaboration	$	14,034	$	11,485

In April 2011, the Company entered into an amendment (the "April 2011 Amendment") to its existing collaboration agreement with Cystic Fibrosis Foundation Therapeutics Incorporated ("CFFT") pursuant to which CFFT agreed to provide financial support for (i) development activities for VX-661, a corrector compound discovered under the collaboration, and (ii) additional research and development activities directed at discovering new corrector compounds.

The Company entered into the original collaboration agreement with CFFT in 2004 and amended it several times to, among other things, provide partial funding for its cystic fibrosis drug discovery and development efforts. In 2006, the Company received a $1.5 million milestone payment from CFFT. There are no additional milestones payable by CFFT to the Company pursuant to the collaboration agreement, as amended. Under the April 2011 Amendment, CFFT agreed to provide the Company with up to $75.0 million in funding over approximately five years for corrector-compound research and development activities. The Company retains the right to develop and commercialize KALYDECO™ (ivacaftor), VX-809, VX-661 and any other compounds discovered during the course of the research collaboration with CFFT. During the three months ended March 31, 2012 and 2011, the Company recognized $3.9 million and $0 in collaborative revenues pursuant to this collaboration, respectively.

In the original agreement, as amended prior to the April 2011 Amendment, the Company agreed to pay CFFT tiered royalties calculated as a percentage, ranging from single digits to sub-teens, of annual net sales of any approved drugs discovered during the research term that ended in 2008, including KALYDECO, VX-809 and VX-661. The April 2011 Amendment provides for a tiered royalty in the same range on net sales of corrector compounds discovered during the research term that began in 2011. The Company also is obligated to make two one-time commercial milestone payments upon achievement of certain sales levels for a potentiator compound such as KALYDECO and two one-time commercial milestone payments upon achievement of certain sales levels for a corrector compound such as VX-809 or VX-661. KALYDECO was approved by the United States Food and Drug Administration ("FDA") on January 31, 2012, and the Company filed its MAA with the EMA for ivacaftor in October 2011.

The Company has royalty obligations to CFFT for each compound commercialized pursuant to this collaboration until the expiration of patents covering that compound. The Company has patents in the United States and European Union covering the composition-of-matter of ivacaftor that expire in 2027 and 2025, respectively, subject to potential patent life extensions. CFFT may terminate its funding obligations under the collaboration, as amended, in certain circumstances, in which case there will be a proportional adjustment to the royalty rates and commercial milestone payments for certain corrector compounds. The collaboration also may be terminated by either party for a material breach by the other, subject to notice and cure provisions.

On June 13, 2011, the Company entered into a license and collaboration agreement (the "Alios Agreement") with Alios, a privately-held biotechnology company. The Company and Alios are collaborating on the research, development and commercialization of two HCV nucleotide analogues discovered by Alios, ALS-2158 and ALS-2200, which are designed to act on the HCV polymerase. Alios and the Company began clinical development of these two HCV nucleotide analogues in December 2011. The Company is responsible for all costs related to development and commercialization of the compounds incurred after the effective date of the Alios Agreement, and manufacturing costs for the supply of ALS-2158 and ALS-2200 used after the effective date, and is providing funding to Alios to conduct the Phase 1 clinical trials for ALS-2158 and ALS-2200 and a research program directed to the discovery of additional HCV nucleotide analogues that act on the HCV polymerase.

Under the terms of the Alios Agreement, the Company received exclusive worldwide rights to ALS-2158 and ALS-2200, and has the option to select additional compounds discovered in the research program. The Company paid Alios a $60.0 million up-front payment, and Alios is eligible to receive research and development milestone payments of up to $715.0 million if two compounds are approved and commercialized. As of December 31, 2011 and March 31, 2012, Alios had earned $35.0 million of these research and development milestones. Alios also is eligible to receive commercial milestone payments of up to $750.0 million, as well as tiered royalties on net sales of approved drugs.

The Company may terminate the Alios Agreement (i) upon 30 days' notice to Alios if the Company ceases development after both ALS-2158 and ALS-2200 have experienced a technical failure and/or (ii) upon 60 days' notice to Alios at any time after the Company completes specified Phase 2a clinical trials. The Alios Agreement also may be terminated by either party for a material breach by the other, and by Alios for the Company's inactivity or if the Company challenges certain Alios patents, in each case subject to notice and cure provisions. Unless earlier terminated, the Alios Agreement will continue in effect until the expiration of the Company's royalty obligations, which expire on a country-by-country basis on the later of (a) the date the last-to-expire patent covering a licensed product expires or (b) ten years after the first commercial sale in the country.

Alios is continuing to operate as a separate entity, is engaged in other programs directed at developing novel drugs that are not covered by the Alios Agreement and maintains ownership of the underlying patent rights that are licensed to the Company pursuant to the Alios Agreement. Under applicable accounting guidance, the Company has determined that Alios is a VIE, that Alios is a business and that the Company is Alios' primary beneficiary. The Company based these determinations on, among other factors, the significance to Alios of the two licensed compounds and on the Company's power, through the joint steering committee for the licensed compounds established under the Alios Agreement, to direct the activities that most significantly affect the economic performance of Alios.

Accordingly, the Company consolidated Alios' statements of operations and financial condition with the Company's consolidated financial statements beginning on June 13, 2011. However, the Company's interests in Alios are limited to those accorded to the Company in the Alios Agreement. In particular, the Company did not acquire any equity interest in Alios, any interest in Alios' cash and cash equivalents or any control over Alios' activities that do not relate to the Alios Agreement. Alios does not have any right to the Company's assets except as provided in the Alios Agreement.

The initial consolidation of a VIE that is determined to be a business is accounted for as a business combination. As a result, as of June 13, 2011 the Company recorded all of Alios' assets and liabilities at fair value on the Company's condensed consolidated balance sheet. The Company continues to consolidate Alios' financial statements, (A) eliminating all intercompany balances and transactions and (B) allocating loss (gain) attributable to the noncontrolling interest in Alios to net loss (gain) attributable to noncontrolling interest (Alios) in the Company's condensed consolidated statement of operations and reflecting noncontrolling interest (Alios) on the Company's condensed consolidated balance sheets.

As of March 31, 2012 and December 31, 2011, the Company had $250.6 million of intangible assets and $4.9 million of goodwill related to Alios. The Company tests Alios' intangible assets and goodwill for impairment on an annual basis as of October 1, and more frequently if indicators are present or changes in circumstance suggest that impairment may exist. In connection with each annual impairment assessment and any interim impairment assessment, the Company compares the fair value of the asset as of the date of the assessment with the carrying value of the asset on the Company's condensed consolidated balance sheet. No impairment has been found with respect to these intangible assets or goodwill since the effective date of the collaboration.

The Company records noncontrolling interest (Alios) on two lines on its condensed consolidated balance sheets. The noncontrolling interest (Alios) is reflected on two separate lines because Alios has both common shareholders and preferred shareholders that are entitled to redemption rights in certain circumstances. The Company records net income (loss) attributable to noncontrolling interest (Alios) on its condensed consolidated statements of operations, reflecting Alios' net income (loss) for the reporting period, adjusted for changes in fair value of contingent milestone and royalty payments, which are evaluated each reporting period. A summary of net loss attributable to noncontrolling interest (Alios) for the three months ended March 31, 2012 is as follows:

	Three Months Ended March 31, 2012

	(in thousands)
Loss before provision for income taxes	$	(5,024	)
Benefit from income taxes		2,280
Change in fair value of contingent milestone and royalty payments		(970	)

Net loss attributable to noncontrolling interest (Alios)	$	(3,714	)

The Company uses present-value models to determine the estimated fair value of the potential contingent milestone and royalty payments, based on assumptions regarding the probability of achieving the relevant milestones, estimates regarding the time to develop the Alios HCV nucleotide analogues, estimates of future cash flows from potential product sales and assumptions regarding the appropriate discount rates. In the three months ended March 31, 2012, the fair value of contingent milestone and royalty payments decreased by $1.0 million based on a rise in interest rates used in the calculation, which increased net income attributable to Vertex. If the Alios HCV nucleotide analogues continue to advance in clinical development, the Company expects it will record increases in the fair value of the contingent milestone and royalty payments in future periods, which may significantly reduce net income attributable to Vertex.

The following summarizes items related to Alios included in the Company's condensed consolidated balance sheets as of March 31, 2012 and December 31, 2011:

	As of March 31, 2012		As of December 31, 2011

	(in thousands)
Restricted cash and cash equivalents (Alios)	$	58,017	$	51,878
Prepaid expenses and other current assets		2,318		2,299
Property and equipment, net		1,903		1,925
Intangible assets		250,600		250,600
Goodwill		4,890		4,890
Other assets		145		133
Accounts payable		1,739		4,132
Accrued expenses and other current liabilities		4,168		4,291
Accrued interest		13		13
Income taxes payable (Alios)		201		12,075
Deferred tax liability		113,840		116,121
Other liabilities		955		1,030
Redeemable noncontrolling interest (Alios)		37,496		37,036
Noncontrolling interest (Alios)		137,583		141,633

The Company has recorded Alios' cash and cash equivalents as restricted cash and cash equivalents (Alios) because (i) the Company does not have any interest in or control over Alios' cash and cash equivalents and (ii) the Alios Agreement does not provide for these assets to be used for the development of the assets that the Company licensed from Alios pursuant to the collaboration. Assets recorded as a result of consolidating Alios' financial condition into the Company's condensed consolidated balance sheets do not represent additional assets that could be used to satisfy claims against the Company's general assets.

The Company's collaborators funded portions of the Company's research and development programs related to specific drugs, drug candidates and research targets, including, in the three months ended March 31, 2012, telaprevir, VX-661 and research directed toward identifying additional corrector compounds for the treatment of cystic fibrosis, and, in the three months ended March 31, 2011, telaprevir. The Company's collaborative revenues, including amortization of up-front license fees and milestone revenues, were $24.4 million and $67.6 million in the three months ended March 31, 2012 and 2011, respectively. The Company's research and development expenses allocated to programs in which a collaborator funded at least a portion of the research and development expenses were approximately $37 million and $25 million in the three months ended March 31, 2012 and 2011, respectively.