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Collaboration arrangements and concentration of credit risk - BMS collaboration - Narrative (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
May 21, 2015
USD ($)
Aug. 31, 2015
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Collaboration arrangements              
License revenues from related party     $ 2,100 $ 2,100 $ 2,700 $ 4,600  
Revenue     2,474 3,050 3,610 6,528  
Minimum              
Collaboration arrangements              
Decrease in revenue         1,900    
License revenues from related party              
Collaboration arrangements              
Revenue     2,108 2,123 2,665 4,574  
Collaboration revenues from related party              
Collaboration arrangements              
Revenue     $ 366 $ 927 945 $ 1,954  
BMS arrangement              
Collaboration arrangements              
Revenue         $ 355   $ 233
License revenue | Bristol Myers Squibb              
Collaboration arrangements              
Upfront payment recorded $ 60,100            
Expected performance term if no exclusivity         10 years    
Average period for completion of pre-clinical phase         4 years    
Average period for completion of clinical development and commercial launch         8 years 6 months    
Percentage of increase in probability of all additional targets         10    
License revenue | Bristol Myers Squibb | First Target Selection              
Collaboration arrangements              
Milestone payments to be received upon achievement         $ 254,000    
License revenue | Bristol Myers Squibb | Second, Third, and Fourth Targets Selection              
Collaboration arrangements              
Target designation payment received   $ 15,000          
License revenue | Bristol Myers Squibb | Fifth through Tenth Targets Selection              
Collaboration arrangements              
Maximum target designation payments to which entitled per agreement         16,500    
License revenue | Bristol Myers Squibb | Other Selected Targets              
Collaboration arrangements              
Milestone payments to be received upon achievement         $ 217,000