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Subsequent Events Subsequent Events (Notes) | 6 Months Ended
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Jun. 30, 2018
Subsequent Events [Abstract] |
Subsequent Events | Subsequent Events AliveGen Inc. In July 2018 we acquired ALG-801 (Phase 1a) and ALG-802 (preclinical) from AliveGen Inc. (AliveGen). ALG-801 (now known as BIIB110) and ALG-802 represent novel ways of targeting the myostatin pathway. We initially plan to study BIIB110 and ALG-802 in multiple neuromuscular indications including SMA and ALS. In connection with the closing of this transaction, we made an upfront payment of $27.5 million to AliveGen and we may pay AliveGen up to $535.0 million in additional potential development and commercialization milestones across both assets and multiple indications.

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- Definition The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 855 -URI http://asc.fasb.org/topic&trid=2122774 + Details
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