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Commitments and Contingencies - Founder Royalty arrangements (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
May 28, 2019
May 31, 2017
Founder Royalty arrangements          
Number of shares into which remaining warrants is exercisable 92,885     114,320  
Research and development $ 25,540 $ 20,761 $ 11,866    
Founders and initial investors | Royalty Agreements          
Founder Royalty arrangements          
Period of royalty payments agreed under arrangement 10 years        
Royalties earned $ 0        
Royalties paid $ 0        
Number of shares into which remaining warrants is exercisable         200,000
Series A Preferred Shares          
Founder Royalty arrangements          
Research and development     $ 900