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Acquisitions, Acquired Intangible Assets, and Goodwill - Purchase Price Allocation (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Aug. 27, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Fair value of tangible assets: |  |  |  |
Goodwill | $ 1,991 | $ 1,991 |  | $ 0
Prowly |  |  |  |
Fair value of tangible assets: |  |  |  |
Cash |  |  | $ 135 |
Accounts receivable |  |  | 193 |
Other assets |  |  | 8 |
Goodwill |  |  | 1,991 |
Identifiable intangible assets |  |  | 1,262 |
Total assets acquired |  |  | 3,589 |
Liabilities assumed |  |  |  |
Accounts payable |  |  | 11 |
Accrued expenses |  |  | 60 |
Deferred revenue |  |  | 80 |
Deferred tax liability |  |  | 121 |
Total liabilities assumed |  |  | 272 |
Net assets acquired |  |  | $ 3,317 |

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