| Goodwill (Details) - USD ($) | 9 Months Ended | 12 Months Ended | 
|---|---|---|
| Sep. 30, 2021 | Dec. 31, 2020 | |
| Goodwill and Intangible Assets Disclosure [Abstract] | ||
| Goodwill | $ 331,342,000 | $ 88,253,000 | 
| Goodwill impairment | 0 | 0 | 
| Goodwill [Roll Forward] | ||
| Goodwill, beginning balance | 88,253,000 | |
| Acquisitions (Note 3) | 264,549,000 | |
| Changes in foreign currency translation | (21,460,000) | |
| Goodwill, ending balance | $ 331,342,000 | $ 88,253,000 | 
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- References No definition available. 
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available. 
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