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Cyclerion Separation - Summary of Expenses of Cyclerion (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2020
Net Loss from Discontinued Operations    
Net loss from discontinued operations $ 37,438  
sGC Business | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff    
Net Loss from Discontinued Operations    
Net loss from discontinued operations 37,438  
Liabilities   $ 0
Assets   $ 0
Research and development | sGC Business | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff    
Net Loss from Discontinued Operations    
Net loss from discontinued operations 21,792  
Selling, general and administrative | sGC Business | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff    
Net Loss from Discontinued Operations    
Net loss from discontinued operations $ 15,646