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Regeneron License and Collaboration Arrangement - Summary of Change in Company's Contract Liabilities (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Contract Assets |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |
Balance at beginning of period |  |  | $ 0
Additions |  |  | 10,000
Additions (Deductions) (1) | [1] |  | (10,000)
Balance at end of period |  |  | 0
Contract Liability |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |
Balance at beginning of period |  | $ 13,980 | 21,883
Additions |  | 370 | 10,000
Additions (Deductions) (1) | [1] | (4,262) | (12,493)
Balance at end of period |  | $ 10,088 | $ 19,390
[1] | Deductions to contract liabilities relate to deferred revenue recognized as revenue during the reporting period.

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