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License Agreements - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Genentech Inc | License Agreement | Research and development |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
Upfront fee paid | $ 0 | $ 0 | $ 0 | $ 0

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