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Collaborative Arrangements and Licensing Agreements (Tables) | 3 Months Ended
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Mar. 31, 2022
Collaborative Arrangements and Licensing Agreements [Abstract] |
Revenue from Collaborative Relationship with Biogen | During the three months ended March 31, 2022 and 2021, we earned the following revenue from our relationship with Biogen (in millions, except percentage amounts):
|  | Three Months Ended March 31, |
|  | 2022 |  |  | 2021 |
SPINRAZA royalties (commercial revenue) |  | $ | 53.8 |  |  | $ | 60.0 |
R&D revenue |  |  | 40.1 |  |  |  | 18.1 |
Total revenue from our relationship with Biogen |  | $ | 93.9 |  |  | $ | 78.1 |
Percentage of total revenue |  |  | 66 | % |  |  | 70 | %

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