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Goodwill and Intangible Assets, Net - Summary of Intangible Assets Acquired Net (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Net Book Value | $ 1,758,796 | $ 1,086,332 | $ 440,905
Long Lived Intangible Assets [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value | 2,275,907 | 1,358,052 | 517,782
Accumulated Amortization | (517,111) | (271,720) | (76,877)
Net Book Value | 1,758,796 | 1,086,332 | 440,905
Short and Long Lived Intangible Assets [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value | 2,314,686 | 1,387,921 | 533,293
Accumulated Amortization | (553,997) | (297,319) | (89,963)
Net Book Value | $ 1,760,689 | $ 1,090,602 | 443,330
Apps [Member] | Short Lived Intangible Assets [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Remaining Useful Life (Years) | 4 months 24 days | 6 months |
Gross Carrying Value | $ 38,779 | $ 29,869 | 15,511
Accumulated Amortization | (36,886) | (25,599) | (13,086)
Net Book Value | $ 1,893 | $ 4,270 | 2,425
Apps [Member] | Long Lived Intangible Assets [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Remaining Useful Life (Years) | 4 years 10 months 24 days | 4 years 3 months 18 days |
Gross Carrying Value | $ 1,905,750 | $ 1,222,417 | 433,805
Accumulated Amortization | (439,885) | (232,832) | (65,838)
Net Book Value | $ 1,465,865 | 989,585 | 367,967
Customer Relationships [Member] | Long Lived Intangible Assets [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Remaining Useful Life (Years) | 11 years 7 months 6 days |  |
Gross Carrying Value | $ 149,389 | 0 |
Accumulated Amortization | (5,533) | 0 |
Net Book Value | $ 143,856 | $ 0 |
User Base [Member] | Long Lived Intangible Assets [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Remaining Useful Life (Years) | 4 years 6 months | 5 years 3 months 18 days |
Gross Carrying Value | $ 68,817 | $ 68,817 | 68,817
Accumulated Amortization | (24,931) | (17,617) | (7,638)
Net Book Value | $ 43,886 | $ 51,200 | 61,179
License Asset [Member] | Long Lived Intangible Assets [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Remaining Useful Life (Years) | 2 months 12 days | 9 months 18 days |
Gross Carrying Value | $ 28,551 | $ 28,551 | 0
Accumulated Amortization | (24,107) | (10,918) | 0
Net Book Value | $ 4,444 | $ 17,633 | 0
Developed technology [Member] | Long Lived Intangible Assets [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Remaining Useful Life (Years) | 5 years 4 months 24 days | 1 year 4 months 24 days |
Gross Carrying Value | $ 89,532 | $ 14,946 | 14,356
Accumulated Amortization | (17,645) | (8,489) | (3,224)
Net Book Value | $ 71,887 | $ 6,457 | 11,132
Other [Member] | Long Lived Intangible Assets [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Remaining Useful Life (Years) | 6 years 3 months 18 days | 7 years 6 months |
Gross Carrying Value | $ 33,868 | $ 23,321 | 804
Accumulated Amortization | (5,010) | (1,864) | (177)
Net Book Value | $ 28,858 | $ 21,457 | $ 627

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