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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Indefinite Lived Intangible Assets Excluding Goodwill [Abstract] |  |  |  |
Short-term investments | $ 0 | $ 0 |  | $ 108,919
Purchases of digital assets | $ 425,000 | $ 425,000 | $ 0 |

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