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Related Party Transactions - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Related Party Transaction [Line Items] |  |  |  |  |
Redeemable convertible preferred stock | 0 |  | 0 |  | 0
Revenue—related party | $ 4,814 | $ 7,465 | $ 833 | $ 9,465 |
Regeneron Pharmaceuticals, Inc. |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Revenue—related party | 4,800 | $ 7,500 | 800 | $ 9,500 |
Deferred revenue | $ 13,100 |  | $ 13,100 |  |
Regeneron Pharmaceuticals, Inc. | Series B Convertible Preferred Stock [ Member ] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Redeemable convertible preferred stock | 883,568 |  | 883,568 |  | 883,568

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- Definition Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.1(c)) -URI http://asc.fasb.org/extlink&oid=120401555&loc=SL114874292-224272 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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