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Commitment and Contingencies - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Other Commitments [Line Items] |  |  |  |  |  |
Rent expense | $ 994 | $ 1,053 | $ 2,875 | $ 3,218 | $ 4,334 | $ 3,718
Total required lease payments | 13,322 |  | 13,322 |  | 8,978 |
Property and equipment, net | 8,391 |  | 8,391 |  | 2,968 | $ 1,605
Data provider |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Committed spending amount for the remainder of the year | 1,602 |  | 1,602 |  | 5,583 |
Committed spending amount for year two | 7,935 |  | 7,935 |  | 6,776 |
Committed spending amount for year three | $ 2,416 |  | $ 2,416 |  | 1,874 |
Data center equipment |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Lease arrangement term | 36 months |  | 36 months |  |  |
Total required lease payments | $ 6,496 |  | $ 6,496 |  | $ 6,045 |
Capital leases |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Property and equipment, net | 4,837 |  | $ 4,837 |  |  |
Depreciation period |  |  | 36 months |  |  |
Current Capital Lease Obligations |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Property and equipment, net | 1,877 |  | $ 1,877 |  |  |
Non-Current Capital Lease Obligations |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Property and equipment, net | $ 2,960 |  | $ 2,960 |  |  |

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