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Regeneron License and Collaboration Arrangement - Additional Information (Details) - USD ($) |  |  | 6 Months Ended | 12 Months Ended
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Jul. 31, 2019 | Jul. 29, 2016 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2018 | Dec. 31, 2017
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |
Licence agreement additional revenue recognised |  |  | $ 5,000.0 |  |  |  |
Licence agreement cumulative revenue recognised |  |  |  | $ 27,800,000 |  |  |
Regeneron Pharmaceuticals, Inc. |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |
Exercise Fee Paid |  |  | 20,000,000.0 |  |  |  |
Contingent Consideration fees |  | $ 20,000,000.0 |  |  |  |  |
Option exercise fee |  |  | 20,000,000.0 |  |  |  |
Contract Assets |  |  | 0 |  |  |  |
Agreement transaction price |  | 55,000,000.0 |  |  |  |  |
Licence agreement additional revenue recognised |  |  | 25,000,000.0 |  |  |  |
Research funding fee |  | 30,000,000.0 |  |  |  |  |
Non refundable upfront payment received |  |  | 25,000,000.0 |  |  |  |
Additional payment for research funding received |  | 30,000,000.0 | $ 20,000,000.0 |  |  | $ 5,000,000.0 | $ 5,000,000.0
License agreement termination description |  |  | twelve (12) years |  |  |  |
Upfront payment |  | $ 25,000,000.0 |  | 25,000,000.0 |  |  |
Licence agreement cumulative revenue recognised |  |  |  |  | $ 10,000,000.0 |  |
Increase in estimated transaction price | $ 35,000.0 |  |  |  |  |  |
Contract liability |  |  | $ 0 | $ 13,100,000 |  |  |
Regeneron Pharmaceuticals, Inc. | Maximum |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |
Licence agreement additional amount payable of option exercise fees |  |  | 80,000,000.0 |  |  |  |
Increase in estimated transaction price |  |  | 45,000,000.0 |  |  |  |
Regeneron Pharmaceuticals, Inc. | Minimum [Member] |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |
Increase in estimated transaction price |  |  | $ 10,000,000.0 |  |  |  |

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