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Commitment & Contingencies - In-License Agreement for Lotilaner (Details) - USD ($) |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 03, 2020 | Jun. 30, 2021 | May 31, 2021 | Apr. 30, 2021 | Sep. 30, 2020 | Jan. 31, 2019 | May 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Research and development |  |  |  |  |  |  |  | $ 7,204,000 |  | $ 1,737,000 | $ 23,465,000 | $ 3,249,000
Common stock issued for license agreement, value |  |  |  |  |  |  |  |  | $ 5,494,000 |  | 5,494,000 | $ 0
License agreement |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Research and development |  |  |  |  | $ 1,000,000.0 | $ 1,000,000.0 |  |  |  |  | $ 2,000,000.0 |
Common stock issued for license agreement (shares) |  |  |  |  | 222,460 |  |  |  |  |  |  |
Common stock issued for license agreement, value |  |  |  |  | $ 3,100,000 |  |  |  |  |  |  |
Common stock issued for license agreement, share price (usd per share) |  | $ 14.0003 |  |  |  |  |  | $ 14.0003 |  |  | $ 14.0003 |
Additional shares to be issued upon 18-month anniversary of contract execution (shares) |  |  |  |  | 187,500 |  |  |  |  |  |  |
Additional shares to be issued upon 18-month anniversary of contract execution, value | $ 5,500,000 |  |  |  |  |  |  |  |  |  |  |
Additional shares to be issued upon 18-month anniversary of contract execution, share price (usd per share) |  |  |  |  | $ 29.30 |  |  |  |  |  |  |
License agreement | LianBio |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Upfront payment received |  | $ 10,000,000.0 | $ 10,000,000.0 | $ 15,000,000.0 |  |  | $ 2,500,000 |  |  |  |  |
License agreement | Elanco |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Upfront payment received |  |  |  |  |  |  | $ 25,000,000 |  |  |  |  |
License agreement | Clinical milestones |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum milestone payments |  | 4,500,000 |  |  |  | 3,000,000.0 |  | $ 4,500,000 |  |  | $ 4,500,000 |
License agreement | Commercial and sales milestones |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum milestone payments |  | $ 77,000,000.0 |  |  |  | $ 79,000,000.0 |  | $ 77,000,000.0 |  |  | $ 77,000,000.0 |

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