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Commitment and Contingencies - Additional Information (Details) |  |  |  | 9 Months Ended
--- | --- | --- | --- | ---
Jul. 30, 2021 USD ($) | Jul. 19, 2021 USD ($) ft² | Jun. 25, 2021 USD ($) | Sep. 30, 2021 USD ($)
Long Term Purchase Commitment [Line Items] |  |  |  |
Amended lease Agreement Description |  |  | the Company entered into an amendment to the Menlo Park lease to extend the term of the lease from March 31, 2022 to June 30, 2022 and replace the previously leased premises (known as 173 and 175-177 Jefferson Drive) with another nearby premises (known as 235 Constitution Drive). |
Operating leases commencement date |  |  |  | Jul. 15, 2021
Change in lease Obligation. |  |  |  | $ 0
Option to Extend, Existence, Operating Lease |  |  |  | true
Lease Expiration Date |  |  |  | Jun. 30, 2022
Operating Lease, Liability |  |  |  | $ 20,535,000
Maximum [Member] |  |  |  |
Long Term Purchase Commitment [Line Items] |  |  |  |
Rent expense recognized |  |  | $ 89,904,000 |
Minimum [Member] |  |  |  |
Long Term Purchase Commitment [Line Items] |  |  |  |
Rent expense recognized |  |  | $ 87,286,000 |
RFS OPCO LLC [Member] |  |  |  |
Long Term Purchase Commitment [Line Items] |  |  |  |
Area of Sublease | ft² |  | 9,501 |  |
Operating Leases, Rent Expense, Sublease Rentals |  | $ 3,500,000 |  |
Cash security deposit received |  | $ 100,000 |  |
Sublease Agreement Description |  | The term of the sublease started on September 1, 2021 and ends on July 30, 2026. The aggregate base rent due to the Company under the Sublease is approximately $3.5 million starting October 1, 2021. |  |
Boston Properties, Inc. [Member] |  |  |  |
Long Term Purchase Commitment [Line Items] |  |  |  |
Operating Lease, Liability |  |  |  | $ 3,100,000
Operating Leases, Rent Expense, Sublease Rentals | $ 9,000 |  |  |
Sublease Agreement Description | The initial lease term commenced on July 30, 2021 and expires on November 30, 2021. In October 2021, the Company extended the lease term to March 31, 2022. The base rent is approximately $9,000 per month. |  |  |

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