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Significant agreements - Dementia Discovery Fund Agreement (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Significant agreements. |  |  |  |  |  |  |
Collaboration revenues |  | $ 1,571 | $ 1,522 | $ 2,700 | $ 7,906 |  |
Deferred revenue |  | 33,082 |  | 33,082 |  | $ 5,657 | $ 14,635
Dementia Discovery Fund |  |  |  |  |  |  |
Significant agreements. |  |  |  |  |  |  |
Upfront cash payment | $ 1,100 |  |  |  |  |  |
Potential milestone payments | $ 700 |  |  |  |  |  |
Threshold period for exercising option to establish a jointly-owned new company | 90 days |  |  |  |  |  |
Option to purchase ownership of new entity | 34.00% |  |  |  |  |  |
Threshold period of notice required for termination of agreement | 60 days |  |  |  |  |  |
Transaction price | $ 1,100 |  |  |  |  |  |
Collaboration revenues |  | 56 | $ 103 | 112 | $ 103 |  |
Deferred revenue |  | $ 582 |  | $ 582 |  | $ 744 |
Dementia Discovery Fund | NewCo |  |  |  |  |  |  |
Significant agreements. |  |  |  |  |  |  |
Option to purchase ownership of new entity | 66.00% |  |  |  |  |  |
Threshold period in which Newco shall have the right to initiate a new research program | 2 years |  |  |  |  |  |
Dementia Discovery Fund | NewCo | Maximum |  |  |  |  |  |  |
Significant agreements. |  |  |  |  |  |  |
Total voting rights related to ownership interests | 50.00% |  |  |  |  |  |

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