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Acquisitions - Fair Value of Assets Acquired and Liabilities Assumed (Details) - Marketwise, LLC - USD ($) $ in Thousands | Jan. 21, 2021 | May 06, 2019 | Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  | $ 23,338 | $ 18,101 | $ 18,101 | $ 17,154
Gold Stock Analyst |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  | $ 947 |  |  |  |
Total assets acquired |  | 1,707 |  |  |  |
Liabilities assumed |  | (224) |  |  |  |
Net assets acquired |  | 1,483 |  |  |  |
Total purchase price |  | 1,483 |  |  |  |
Gold Stock Analyst | Tradenames |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangibles |  | 195 |  |  |  |
Gold Stock Analyst | Customer relationships |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangibles |  | $ 565 |  |  |  |
Chaikin Holdings LLC. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash | $ 151 |  |  |  |  |
Other current assets | 152 |  |  |  |  |
Goodwill | 5,237 |  |  |  |  |
Other noncurrent assets | 443 |  |  |  |  |
Total assets acquired | 10,551 |  |  |  |  |
Liabilities assumed | (2,451) |  |  |  |  |
Net assets acquired | 8,100 |  |  |  |  |
Cash consideration | 7,290 |  |  |  |  |
Non-controlling interest | 810 |  |  |  |  |
Total purchase price | 8,100 |  |  |  |  |
Chaikin Holdings LLC. | Tradenames |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangibles | 657 |  |  |  |  |
Chaikin Holdings LLC. | Customer relationships |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangibles | 3,664 |  |  |  |  |
Chaikin Holdings LLC. | Capitalized software development costs |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangibles | $ 247 |  |  |  |  |

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