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v3.21.1

Collaborative Arrangements and Licensing Agreements (Details) $ in Thousands | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Apr. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) Medicine | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($)
Collaborative Arrangement and Licensing Agreement [Abstract] |  |  |  |
Revenue |  | $ 111,607 | $ 133,367 |
SPINRAZA Royalties [Member] |  |  |  |
Collaborative Arrangement and Licensing Agreement [Abstract] |  |  |  |
Revenue |  | 59,986 | 66,008 |
R&D Revenue [Member] |  |  |  |
Collaborative Arrangement and Licensing Agreement [Abstract] |  |  |  |
Revenue |  | $ 27,159 | 49,406 |
Biogen [Member] |  |  |  |
Collaborative Arrangement and Licensing Agreement [Abstract] |  |  |  |
Number of medicines currently being developed | Medicine |  | 8 |  |
Cumulative payments received |  | $ 2,900,000 |  |
Revenue |  | 78,100 | $ 87,400 |
Deferred revenue |  | $ 447,700 |  | $ 465,800
Biogen [Member] | Revenue [Member] | Strategic Partner [Member] |  |  |  |
Collaborative Arrangement and Licensing Agreement [Abstract] |  |  |  |
Concentration percentage |  | 70.00% | 66.00% |
Biogen [Member] | SPINRAZA Royalties [Member] |  |  |  |
Collaborative Arrangement and Licensing Agreement [Abstract] |  |  |  |
Revenue |  | $ 60,000 | $ 66,000 |
Biogen [Member] | R&D Revenue [Member] |  |  |  |
Collaborative Arrangement and Licensing Agreement [Abstract] |  |  |  |
Revenue |  | $ 18,100 | $ 21,400 |
2013 Strategic Neurology [Member] | Plan [Member] |  |  |  |
Collaborative Arrangement and Licensing Agreement [Abstract] |  |  |  |
Next prospective payment | $ 8,000 |  |  |
2013 Strategic Neurology [Member] | ION541 [Member] | Subsequent Event [Member] |  |  |  |
Collaborative Arrangement and Licensing Agreement [Abstract] |  |  |  |
Milestone payment achieved | $ 10,000 |  |  |

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