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v3.19.3.a.u2

Subsequent Events (Details) - Subsequent Event | 1 Months Ended | 11 Months Ended
--- | --- | ---
Feb. 28, 2020 USD ($) product_target $ / shares | Dec. 31, 2020 USD ($) shares
Subsequent Event [Line Items] |  |
Agreement restriction, ownership percentage (less than) | 5.00% |
Biogen MA Inc | Collaboration and license agreement |  |
Subsequent Event [Line Items] |  |
Number of neurological disease gene targets | product_target | 12 |
Number of product targets selected | product_target | 3 |
Number of additional neurological disease gene targets | product_target | 9 |
Target selection period | 5 years |
Biogen MA Inc | Collaboration and license agreement | Forecast |  |
Subsequent Event [Line Items] |  |
Proceeds from collaborators |  | $ 125,000,000.0
Biogen MA Inc | Collaboration and license agreement | Pre-approval Milestone |  |
Subsequent Event [Line Items] |  |
Maximum milestone payment receivable | $ 925,000,000.0 |
Biogen MA Inc | Collaboration and license agreement | Sales-based Milestone |  |
Subsequent Event [Line Items] |  |
Maximum milestone payment receivable | 1,445,000,000.0 |
Biogen MA Inc | Collaboration and license agreement | Achievement of specified research, clinical development, regulatory and first commercial sale milestones |  |
Subsequent Event [Line Items] |  |
Maximum milestone payment receivable | $ 2,370,000,000 |
Biogen MA Inc | Stock Purchase Agreement |  |
Subsequent Event [Line Items] |  |
Agreement restriction expiration period | 3 years |
Agreement restriction, percentage of shares held | 50.00% |
Agreement provision, expiration period | 2 years |
Agreement provision, ownership percentage (less than) | 5.00% |
Biogen MA Inc | Stock Purchase Agreement | Forecast |  |
Subsequent Event [Line Items] |  |
Sale of stock, number of shares issued in transaction (in shares) | shares |  | 24,420,157
Sale of stock, price per share (in dollars per share) | $ / shares | $ 9.2137 |
Consideration received from sale of stock |  | $ 225,000,000.0

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