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Fair Value Measurements - Summary of Financial Instruments Measured at Fair Value (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Fair Value By Fair Value Hierarchy Level [Line Items] |  |  |
Balance Sheet Location | Deferred acquisition costs, current | Deferred acquisition costs, current |
Financial Assets | $ 825,759 | $ 12,093 |
Financial Liability | $ 25,000 | $ 46,500 |
Money market funds [Member] |  |  |
Fair Value By Fair Value Hierarchy Level [Line Items] |  |  |
Balance Sheet Location | Cash and cash equivalents | Cash and cash equivalents | Cash and cash equivalents
Financial Assets | $ 820,594 | $ 6,413 | $ 340,532
Marketable security [Member] |  |  |
Fair Value By Fair Value Hierarchy Level [Line Items] |  |  |
Balance Sheet Location | Prepaid expenses and other current assets |  |
Financial Assets | $ 5,165 |  |
Embedded derivative [Member] |  |  |
Fair Value By Fair Value Hierarchy Level [Line Items] |  |  |
Balance Sheet Location |  | Long-term debt |
Financial Assets |  | $ 5,680 |
Convertible security [Member] |  |  |
Fair Value By Fair Value Hierarchy Level [Line Items] |  |  |
Balance Sheet Location |  | Deferred acquisition costs, current |
Financial Liability |  | $ 46,500 |
Interest Rate Swap [Member] |  |  |
Fair Value By Fair Value Hierarchy Level [Line Items] |  |  |
Balance Sheet Location |  |  | Accrued liabilities
Financial Liability |  |  | $ 5,336
Level 1 [Member] |  |  |
Fair Value By Fair Value Hierarchy Level [Line Items] |  |  |
Financial Assets | 825,759 | 6,413 |
Financial Liability | 25,000 | 0 |
Level 1 [Member] | Money market funds [Member] |  |  |
Fair Value By Fair Value Hierarchy Level [Line Items] |  |  |
Financial Assets | 820,594 | 6,413 | 340,532
Level 1 [Member] | Marketable security [Member] |  |  |
Fair Value By Fair Value Hierarchy Level [Line Items] |  |  |
Financial Assets | 5,165 |  |
Level 1 [Member] | Embedded derivative [Member] |  |  |
Fair Value By Fair Value Hierarchy Level [Line Items] |  |  |
Financial Assets |  | 0 |
Level 2 [Member] |  |  |
Fair Value By Fair Value Hierarchy Level [Line Items] |  |  |
Financial Assets | 0 | 0 |
Financial Liability | 0 | 0 |
Level 2 [Member] | Money market funds [Member] |  |  |
Fair Value By Fair Value Hierarchy Level [Line Items] |  |  |
Financial Assets | 0 | 0 |
Level 2 [Member] | Embedded derivative [Member] |  |  |
Fair Value By Fair Value Hierarchy Level [Line Items] |  |  |
Financial Assets |  | 0 |
Level 2 [Member] | Interest Rate Swap [Member] |  |  |
Fair Value By Fair Value Hierarchy Level [Line Items] |  |  |
Financial Liability |  |  | $ 5,336
Level 3 [Member] |  |  |
Fair Value By Fair Value Hierarchy Level [Line Items] |  |  |
Financial Assets | 0 | 5,680 |
Financial Liability | 0 | 46,500 |
Level 3 [Member] | Money market funds [Member] |  |  |
Fair Value By Fair Value Hierarchy Level [Line Items] |  |  |
Financial Assets | $ 0 | 0 |
Level 3 [Member] | Embedded derivative [Member] |  |  |
Fair Value By Fair Value Hierarchy Level [Line Items] |  |  |
Financial Assets |  | 5,680 |
Level 3 [Member] | Convertible security [Member] |  |  |
Fair Value By Fair Value Hierarchy Level [Line Items] |  |  |
Financial Liability |  | $ 46,500 |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities. + References No definition available. + Details
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