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Goodwill and Intangible Assets, Net - Schedule of Intangible Assets, Net (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Finite-Lived Intangible Assets, Net [Abstract] |  |
Cost | $ 18,789 | $ 14,121
Accumulated Amortization | (10,778) | (9,042)
Net Book Value | 8,011 | 5,079
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Indefinite-lived intangible assets | 1,085 | 199
Cost | 19,874 | 14,320
Intangible assets, net | 9,096 | 5,278
Cryptocurrencies |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Indefinite-lived intangible assets | 0 | 4
Internet domain names |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Indefinite-lived intangible assets | 1,085 | 195
Customer relationships |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Cost | 12,369 | 8,705
Accumulated Amortization | (7,799) | (6,675)
Net Book Value | $ 4,570 | $ 2,030
Weighted-Average Remaining Useful Life (in years) | 4 years 7 months 6 days | 2 years 8 months 12 days
Tradenames |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Cost | $ 3,578 | $ 2,921
Accumulated Amortization | (1,739) | (1,433)
Net Book Value | $ 1,839 | $ 1,488
Weighted-Average Remaining Useful Life (in years) | 5 years 6 months | 4 years 10 months 24 days
Capitalized software development costs |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Cost | $ 2,842 | $ 2,495
Accumulated Amortization | (1,240) | (934)
Net Book Value | $ 1,602 | $ 1,561
Weighted-Average Remaining Useful Life (in years) | 3 years 1 month 6 days | 3 years 9 months 18 days

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