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Collaboration arrangements and concentration of credit risk - BMS collaboration - Narrative (Details) $ in Thousands |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 24, 2021 USD ($) | Dec. 01, 2020 USD ($) item | Jun. 24, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) item | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Collaboration arrangements |  |  |  |  |  |  |  |
Number of collaboration targets | item |  |  |  |  |  | 4 |  |
Revenue |  |  |  | $ 463,868 | $ 1,535 | $ 464,322 | $ 1,639 |
Accounts receivables |  |  |  | $ 2,705 |  | $ 2,705 |  | $ 6,618
Tax rate enacted in the Netherlands |  |  |  | 25.00% |  | 25.00% |  |
Tax benefit past share issuance cost |  |  |  | $ 2,977 |  | $ 2,977 |  |
CSL Behring collaboration |  |  |  |  |  |  |  |
Collaboration arrangements |  |  |  |  |  |  |  |
Revenue |  |  |  | 462,400 |  | 462,400 |  |
Upfront cash to receive upon the closing of the agreement | $ 450,000 |  | $ 450,000 |  |  |  |  |
Other payments received | $ 12,400 |  |  |  |  |  |  |
Accounts receivables |  |  |  | 1,300 |  | 1,300 |  | $ 2,100
Regulatory and commercial milestone payments received |  |  | $ 1,600,000 |  |  |  |  |
License revenues from related party |  |  |  |  |  |  |  |
Collaboration arrangements |  |  |  |  |  |  |  |
Revenue |  |  |  |  | 1,530 |  | 1,577 |
Collaboration revenues from related party |  |  |  |  |  |  |  |
Collaboration arrangements |  |  |  |  |  |  |  |
Revenue |  |  |  |  | 5 |  | 62 |
Collaboration revenues |  |  |  |  |  |  |  |
Collaboration arrangements |  |  |  |  |  |  |  |
Revenue |  |  |  | 1,468 |  | $ 1,922 |  |
Collaboration revenues | CSL Behring collaboration |  |  |  |  |  |  |  |
Collaboration arrangements |  |  |  |  |  |  |  |
Revenue |  |  |  | $ 400 | $ 0 |  | $ 0 |
BMS arrangement | Bristol Myers Squibb |  |  |  |  |  |  |  |
Collaboration arrangements |  |  |  |  |  |  |  |
Initial research term |  |  |  |  |  | 4 years |  |
Number of collaboration targets | item |  | 4 |  |  |  |  |  |
Collaboration Agreement, Threshold Number Of Collaboration Targets That Can Be Replaced | item |  | 2 |  |  |  |  |  |
Threshold Number Of New Collaboration Targets In The Field Of Cardiovascular Disease | item |  | 2 |  |  |  |  |  |
License revenue | Bristol Myers Squibb |  |  |  |  |  |  |  |
Collaboration arrangements |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  | $ 0 |  |
Bristol Myers Squibb | BMS arrangement |  |  |  |  |  |  |  |
Collaboration arrangements |  |  |  |  |  |  |  |
Collaboration Agreement, Threshold Research, Development And Regulatory Milestone Payments Receivable |  | $ 217,000 |  |  |  |  |  |

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