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Acquisitions - Narrative (Details) - Marketwise, LLC - USD ($) $ in Thousands |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Jan. 21, 2021 | Jan. 05, 2020 | May 06, 2019 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Cash paid for acquisitions, net of cash acquired | $ 7,139 |  |  |  |  | $ 7,139 | $ 0 | $ 0 | $ 1,483 | $ 0
Amortization of intangible assets |  |  |  | $ 582 | $ 524 | 1,223 | $ 1,046 | 2,102 | 1,710 | $ 1,721
Amortization of acquired intangible assets |  |  |  | 206 |  | 362 |  |  |  |
TradeSmith |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of interests acquired |  | 25.00% |  |  |  |  |  |  |  |
Business combination, step acquisition, equity interest in acquiree, including subsequent acquisition, percentage |  | 100.00% |  |  |  |  |  |  |  |
Total consideration, up to |  | $ 9,164 |  |  |  |  |  |  |  |
Business acquisition, transaction costs |  |  |  | $ 164 |  | $ 164 |  | $ 164 | 443 |
Gold Stock Analyst |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of interests acquired |  |  | 100.00% |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  |  |  |  | $ 77 |
Total consideration, up to |  |  | $ 1,483 |  |  |  |  |  |  |
Gold Stock Analyst | Tradenames |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life (years) |  | 8 years 6 months |  |  |  |  |  |  |  |
Gold Stock Analyst | Customer relationships |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life (years) |  | 6 years |  |  |  |  |  |  |  |
Chaikin Holdings LLC. |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of interests acquired | 90.00% |  |  |  |  |  |  |  |  |
Total consideration, up to | $ 8,100 |  |  |  |  |  |  |  |  |
Chaikin Holdings LLC. | Tradenames |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life (years) | 8 years 6 months |  |  |  |  |  |  |  |  |
Chaikin Holdings LLC. | Customer relationships |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life (years) | 6 years |  |  |  |  |  |  |  |  |

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