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Business combinations - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 11 Months Ended 12 Months Ended
Dec. 23, 2017
Jan. 31, 2018
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2017
Business Acquisition [Line Items]                    
Consideration transferred, net of cash acquired             $ 0 $ 0 $ 6,213  
Goodwill recognized   $ 3,513 $ 2,236   $ 2,236   2,392 2,380 3,513 $ 836
Revenue     170 $ 156 494 $ 647 743 57,088 16,104  
Gain contributed to the Group's total comprehensive loss     $ (15,276) $ (7,938) $ (26,121) $ (13,713) $ (28,933) $ 9,478 (27,667)  
Discuva Limited                    
Business Acquisition [Line Items]                    
Percentage of share capital acquired 100.00%                  
Consideration transferred, cash $ 8,149                  
Consideration transferred, net of cash acquired 6,400                  
Consideration transferred, shares issued $ 6,690                  
Share price (in dollars per share) $ 11.41                  
Number of shares issued (in shares) 586,854                  
Goodwill recognized $ 2,427                  
Assumed contingent liabilities 1,961                  
Gross contractual amount for trade and other receivables 1,500                  
Revenue   $ 400                
Percentage of Group's revenue   2.60%                
Gain contributed to the Group's total comprehensive loss   $ 30                
Acquisition related costs                 $ 500  
Discuva Limited | Software licenses | Discuva platform acquired                    
Business Acquisition [Line Items]                    
Identifiable intangible assets recognized $ 14,275