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Collaboration and Other Agreements - Boehringer Ingelheim International GmbH (Details) - Boehringer Collaboration and License Agreement - Boehringer Ingelheim International GmbH $ in Millions | 1 Months Ended | 12 Months Ended | 61 Months Ended
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Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Oct. 31, 2015 USD ($) productCandidate
Collaboration and Other Agreements [Line Items] |  |  |
Term of agreement (in years) |  |  | 5 years
Number of product candidates to develop | productCandidate |  |  | 2
Non-refundable upfront payment |  |  | $ 15.0
Development milestones | $ 12.0 |  |
Development milestones recognized |  | $ 12.0 |

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