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Related Party Transactions (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Related Party Transactions      
Accounts payable due related party $ 1,058   $ 1,509
Investor | Allergan      
Related Party Transactions      
Accounts receivable 73,400   106,000
Board of Directors member      
Related Party Transactions      
Amount of insurance premium paid to the insurance provider 2,400 $ 2,500  
Related party prepaid assets 600    
Accounts payable due to related party 0   0
Board of Directors member | Cyclerion Therapeutics, Inc.      
Related Party Transactions      
Accounts payable due related party $ 1,100   $ 1,500