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Significant agreements - Genetech Collaboration Agreement (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 21, 2020 USD ($) item | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Significant agreements. |  |  |  |  |  |  |
Collaboration revenues |  | $ 1,571 | $ 1,522 | $ 2,700 | $ 7,906 |  |
Deferred revenue |  | 33,082 |  | 33,082 |  | $ 5,657 | $ 14,635
Genetech |  |  |  |  |  |  |
Significant agreements. |  |  |  |  |  |  |
Number of Potential development candidates | item | 4 |  |  |  |  |  |
Upfront cash payment | $ 30,000 |  |  |  |  |  |
Number of immuno oncology targets | item | 2 |  |  |  |  |  |
Expansion Fee | $ 10,000 |  |  |  |  |  |
Number of collaboration programs | item | 2 |  |  |  |  |  |
Transaction price | $ 31,000 |  |  |  |  |  |
Collaboration revenues |  | 1,196 | $ 0 | 1,857 |  |  |
Deferred revenue |  | 27,693 |  | $ 27,693 |  |  |
Period over which performance obligations will be performed |  |  |  | 2 years |  |  |
Material rights exercise period |  |  |  | 4 years |  |  |
Genetech | Royalty |  |  |  |  |  |  |
Significant agreements. |  |  |  |  |  |  |
Number of years over which royalty is payable |  |  |  | 10 years |  |  |
Genetech | Maximum |  |  |  |  |  |  |
Significant agreements. |  |  |  |  |  |  |
Additional number of immuno oncology targets | item | 2 |  |  |  |  |  |
Regulatory, and initial commercialization milestones, payments receivable | $ 200,000 |  |  |  |  |  |
Genetech | Development milestone | Maximum |  |  |  |  |  |  |
Significant agreements. |  |  |  |  |  |  |
Sales milestone payments, receivable | 65,000 |  |  |  |  |  |
Genetech | Regulatory milestone | Maximum |  |  |  |  |  |  |
Significant agreements. |  |  |  |  |  |  |
Sales milestone payments, receivable | 135,000 |  |  |  |  |  |
Genetech | Collaboration Program 1 Performance Obligation |  |  |  |  |  |  |
Significant agreements. |  |  |  |  |  |  |
Transaction price | 3,775 |  |  |  |  |  |
Genetech | Collaboration Program 2 Performance Obligation |  |  |  |  |  |  |
Significant agreements. |  |  |  |  |  |  |
Regulatory, and initial commercialization milestones, payments receivable | 8,000,000,000 |  |  |  |  |  |
Transaction price | $ 7,550 |  |  |  |  |  |
Genetech | Specified Targeting Arm Material Right Arm Program One |  |  |  |  |  |  |
Significant agreements. |  |  |  |  |  |  |
Number of initial collaboration programs exercised | item | 1 |  |  |  |  |  |
Sales milestone payments, receivable | $ 1,000 |  |  |  |  |  |
Transaction price | 330 |  |  |  |  |  |
Genetech | Two material rights associated with the LSR Go Option for Collaboration Programs One And Two |  |  |  |  |  |  |
Significant agreements. |  |  |  |  |  |  |
Transaction price | 11,650 |  |  |  |  |  |
Genetech | Material rights for associated and limited substitution rights |  |  |  |  |  |  |
Significant agreements. |  |  |  |  |  |  |
Transaction price | $ 1,115 |  |  |  |  |  |
Genetech | Two material rights for Expansion Options |  |  |  |  |  |  |
Significant agreements. |  |  |  |  |  |  |
Number of expansion option collaboration programs | item | 2 |  |  |  |  |  |
Transaction price | $ 6,580 |  |  |  |  |  |
Genetech | Collaboration Program One and Two Performance Obligation | Maximum |  |  |  |  |  |  |
Significant agreements. |  |  |  |  |  |  |
Sales milestone payments, receivable | $ 200,000 |  |  |  |  |  |
Genetech | Material rights |  |  |  |  |  |  |
Significant agreements. |  |  |  |  |  |  |
Deferred revenue |  | $ 19,700 |  | $ 19,700 |  |  |

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