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Summary of Significant Accounting Policies - Cost of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Product Information [Line Items] |  |  |  |  |  |  |  |  |
Amortization of acquired technologies | $ 1,037 | $ 2,700 | $ 6,132 | $ 5,700 | $ 3,741 | $ 11,876 | $ 24,257 | $ 24,067 | $ 26,428
Subscription and other revenue |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |
Amortization of acquired technologies | $ 1,037 |  | $ 6,132 |  | $ 3,741 | $ 11,876 |  |  |

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