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Subsequent events (Details) - Arrangement - Marathon Pharmaceuticals, LLC
shares in Millions, $ in Millions
Mar. 16, 2017
USD ($)
shares
Subsequent Event  
Subsequent Event [Line Items]  
Acquisition price $ 140
Payments to acquire 75
Equity interest issued or issuable $ 65
Trading day period 15 days
Threshold 19.90%
Equity interest issued or issuable, number of shares (in shares) | shares 6.9
Scenario, Forecast  
Subsequent Event [Line Items]  
Development and regulatory milestone payments which the entity may be obligated to pay $ 50