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Amgen license agreement (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Aug. 31, 2019
Nov. 30, 2018
Jun. 30, 2018
Mar. 31, 2020
Mar. 31, 2019
Research and Development Arrangement, Contract to Perform for Others [Line Items]          
Research and development expense       $ 8,791 $ 4,063
Amgen          
Research and Development Arrangement, Contract to Perform for Others [Line Items]          
Payment for clinical trail $ 2,500        
Amgen Agreement          
Research and Development Arrangement, Contract to Perform for Others [Line Items]          
Initial fair value of the anti-dilution right liability   $ 7,404      
Amgen Agreement | Maximum          
Research and Development Arrangement, Contract to Perform for Others [Line Items]          
Aggregate milestone payments upon the achievement of specified clinical and regulatory milestones 37,500        
Aggregate milestone payments upon the achievement of specified commercial milestones $ 75,000        
Amgen Agreement | Amgen          
Research and Development Arrangement, Contract to Perform for Others [Line Items]          
Ownership interest of the outstanding shares (as a percent)     10.00%    
Amgen Agreement | Research and development expense          
Research and Development Arrangement, Contract to Perform for Others [Line Items]          
Initial fair value of the anti-dilution right liability     $ 1,639    
Research and development expense       $ 0 $ 0
Amgen Agreement | Amgen          
Research and Development Arrangement, Contract to Perform for Others [Line Items]          
Upfront payment     $ 5,000    
Amgen Agreement | Series A Preferred Stock          
Research and Development Arrangement, Contract to Perform for Others [Line Items]          
Share Issued under agreement   3,205,128      
Amgen Agreement | Series A Preferred Stock | Amgen          
Research and Development Arrangement, Contract to Perform for Others [Line Items]          
Share Issued under agreement     2,653,333    
Share Issued value under agreement     $ 1,353