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Regeneron License and Collaboration Arrangement - Summary of Change in Company's Contract Liabilities (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2021 | Jun. 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] |  | 0
Balance at end of period |  |  | 10,000
Contract Liability |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |
Balance at beginning of period |  | $ 13,980 | 21,883
Additions |  |  | 10,000
Additions (Deductions) (1) | [1] | 833 | (9,465)
Balance at end of period |  | $ 13,147 | $ 22,418
[1] | Deductions to contract liabilities relate to deferred revenue recognized as revenue during the reporting period.

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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