Intangible Assets and Goodwill	3 Months Ended
Intangible Assets and Goodwill	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets and Goodwill	Intangible Assets and Goodwill Intangible Assets In October 2014, the Company recorded $29.0 million of an in-process research and development intangible asset on its condensed consolidated balance sheet based on the Company’s estimate of the fair value of VX-210, a drug candidate for patients with spinal cord injuries that is licensed by the Company from BioAxone. The Company used a 7.5% discount rate in the present-value models used to estimate the fair value of the in-process research and development asset. The Company also conducted an evaluation of BioAxone’s other programs and determined that market participants would not have ascribed value to those assets because of the stage of development of those assets. As of March 31, 2015, the Company did not have any additional intangible assets recorded on its condensed consolidated balance sheet. Goodwill As of March 31, 2015 and December 31, 2014, goodwill of $39.9 million was recorded on the Company's condensed consolidated balance sheets. There were no changes to goodwill recorded during the three months ended March 31, 2015 or 2014.

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

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