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Agreements - Gilead (Details) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Dec. 19, 2018 item | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Agreements |  |  |
Revenue earned |  | $ 15,403 | $ 20,492
Accounts receivable |  |  | 25,000
Gilead |  |  |
Agreements |  |  |
Number of programs | item | 3 |  |
Option exercise period | 90 days |  |
Revenue proceeds |  |  | 25,000
Revenue earned |  | $ 15,400 | $ 20,500

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