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Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Feb. 12, 2015 | Dec. 31, 2014
Intangible assets |  |  |  |  |  |
Total intangible assets, gross | $ 7,645,800 |  | $ 7,645,800 |  |  | $ 7,207,100
Accumulated Amortization | (3,464,600) |  | (3,464,600) |  |  | (3,178,600)
Intangible assets, net | 4,181,245 |  | 4,181,245 |  |  | 4,028,507
Intangible Assets and Goodwill (Textual) [Abstract] |  |  |  |  |  |
Amortization of acquired intangible assets | 98,065 | $ 122,431 | 285,972 | $ 382,515 |  |
Accumulated impairment losses related to goodwill | 0 |  | 0 |  |  |
Expected future amortization expense, 2015 (remaining three months) | 94,300 |  | 94,300 |  |  |
Expected future amortization expense, 2016 | 348,800 |  | 348,800 |  |  |
Expected future amortization expense, 2017 | 318,600 |  | 318,600 |  |  |
Expected future amortization expense, 2018 | 291,000 |  | 291,000 |  |  |
Expected future amortization expense, 2019 | 275,100 |  | 275,100 |  |  |
Expected future amortization expense, 2020 | 269,100 |  | 269,100 |  |  |
Total | 1,596,900 |  | 1,596,900 |  |  |
Out-licensed patents |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Cost | 543,300 |  | 543,300 |  |  | 543,300
Accumulated Amortization | (499,900) |  | (499,900) |  |  | (481,700)
Net | 43,400 |  | $ 43,400 |  |  | 61,600
Out-licensed patents | Minimum |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Estimated life, (in years) |  |  | 13 years |  |  |
Out-licensed patents | Maximum |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Estimated life, (in years) |  |  | 23 years |  |  |
Developed technology |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Cost | 3,005,300 |  | $ 3,005,300 |  |  | 3,005,300
Accumulated Amortization | (2,523,800) |  | (2,523,800) |  |  | (2,396,800)
Net | 481,500 |  | $ 481,500 |  |  | 608,500
Developed technology | Minimum |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Estimated life, (in years) |  |  | 15 years |  |  |
Developed technology | Maximum |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Estimated life, (in years) |  |  | 23 years |  |  |
Developed technology | AVONEX |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Net | 472,900 |  | $ 472,900 |  |  |
Acquired and in-licensed rights and patents |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Cost | 3,297,600 |  | 3,297,600 |  |  | 3,280,400
Accumulated Amortization | (440,900) |  | (440,900) |  |  | (300,100)
Net | 2,856,700 |  | $ 2,856,700 |  |  | 2,980,300
Acquired and in-licensed rights and patents | Minimum |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Estimated life, (in years) |  |  | 3 years |  |  |
Acquired and in-licensed rights and patents | Maximum |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Estimated life, (in years) |  |  | 17 years |  |  |
In-process research and development |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Indefinite lived intangible assets useful life |  |  | Indefinite until commercialization |  |  |
Cost and Net | 735,600 |  | $ 735,600 |  |  | 314,100
Accumulated Amortization | 0 |  | $ 0 |  |  | 0
Impairment of IPR&D intangible asset |  | $ 16,200 |  |  |  |
In-process research and development | Out-licensed patents |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Total impairment charges |  |  |  | $ 50,900 |  |
Trademarks and trade names |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Indefinite lived intangible assets useful life |  |  | Indefinite |  |  |
Cost and Net | 64,000 |  | $ 64,000 |  |  | 64,000
Accumulated Amortization | 0 |  | 0 |  |  | $ 0
Convergence Pharmaceuticals |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
In-process research and development and other intangible assets |  |  |  |  | $ 424,600 |
Convergence Pharmaceuticals | In-process research and development |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
In-process research and development and other intangible assets |  |  |  |  | $ 424,600 |
TYSABRI product | Acquired and in-licensed rights and patents |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Net | $ 2,797,500 |  | $ 2,797,500 |  |  |

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