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Collaboration and Licensing Agreements - Deferred Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2021
Current deferred revenue |  |
Beginning balance |  | $ 4,177
Ending balance | $ 1,412 | 1,412
Non-current deferred revenue |  |
Beginning balance |  | 0
Ending balance | 2,947 | 2,947
2019 KKC Agreement |  |
Current deferred revenue |  |
Beginning balance |  | 4,177
Decreases due to revenue recognized in the period for which cash has been received |  | (2,765)
Ending balance | 1,412 | 1,412
2017 KKC Agreement |  |
Non-current deferred revenue |  |
Beginning balance |  | 0
Increases to amounts invoiced for which cash has been received | 2,900 | 2,947
Ending balance | $ 2,947 | $ 2,947

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