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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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Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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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.

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