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Cyclerion Separation - Summary of Expenses of Cyclerion (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
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 $ 0 37,438  
Liabilities 0   $ 0
Assets $ 0   $ 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