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Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Feb. 12, 2015 | Dec. 31, 2014
Intangible assets |  |  |  |  |  |
Total intangible assets, gross | $ 7,661,300 |  | $ 7,661,300 |  |  | $ 7,207,100
Accumulated Amortization | (3,366,500) |  | (3,366,500) |  |  | (3,178,600)
Intangible assets, net | 4,294,791 |  | 4,294,791 |  |  | 4,028,507
Intangible Assets and Goodwill (Textual) [Abstract] |  |  |  |  |  |
Amortization of acquired intangible assets | 92,004 | $ 116,826 | 187,907 | $ 260,084 |  |
Accumulated impairment losses related to goodwill | 0 |  | 0 |  |  |
Expected future amortization expense, 2015 (remaining six months) | 185,500 |  | 185,500 |  |  |
Expected future amortization expense, 2016 | 312,500 |  | 312,500 |  |  |
Expected future amortization expense, 2017 | 285,800 |  | 285,800 |  |  |
Expected future amortization expense, 2018 | 281,600 |  | 281,600 |  |  |
Expected future amortization expense, 2019 | 270,600 |  | 270,600 |  |  |
Expected future amortization expense, 2020 | 263,800 |  | 263,800 |  |  |
Total | 1,599,800 |  | 1,599,800 |  |  |
Out-licensed patents |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Cost | 543,300 |  | 543,300 |  |  | 543,300
Accumulated Amortization | (493,900) |  | (493,900) |  |  | (481,700)
Net | 49,400 |  | $ 49,400 |  |  | 61,600
Impairment of out-licensed patent |  | $ 34,700 |  |  |  |
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 | (2,492,100) |  | (2,492,100) |  |  | (2,396,800)
Net | 513,200 |  | $ 513,200 |  |  | 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 | 504,300 |  | $ 504,300 |  |  |
Acquired and in-licensed rights and patents |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Cost | 3,296,700 |  | 3,296,700 |  |  | 3,280,400
Accumulated Amortization | (380,500) |  | (380,500) |  |  | (300,100)
Net | 2,916,200 |  | $ 2,916,200 |  |  | 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 |  |  |  |  |  |
Cost and Net | 752,000 |  | $ 752,000 |  |  | 314,100
Accumulated Amortization | 0 |  | $ 0 |  |  | 0
Trademarks and trade names |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Indefinite lived intangible assets useful life |  |  |  |  |  |
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 |
TYSABRI product | Acquired and in-licensed rights and patents |  |  |  |  |  |
Intangible assets |  |  |  |  |  |
Net | $ 2,851,900 |  | $ 2,851,900 |  |  |

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