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Collaboration arrangements and concentration of credit risk - Amounts owed by BMS (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
May 31, 2015
item
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
item
shares
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
shares
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Common Stock, Shares, Outstanding | shares   37,839,833   37,839,833   37,351,653
Total revenues   $ 2,474 $ 3,050 $ 3,610 $ 6,528  
Amounts owed in relation to the collaboration services   355   355   $ 233
BMS arrangement            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Total revenues       355   233
BMS arrangement | Bristol Myers Squibb            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Number of collaboration targets | item 4          
Amounts owed in relation to the collaboration services   $ 355   $ 355   $ 233
BMS arrangement | Maximum | Bristol Myers Squibb            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Number of collaboration targets | item       10