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Summary of Significant Accounting Policies - Other Narrative (Details) (10-K) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  | 1 |  |
Foreign currency transactional and re-measurement exchange (losses) and gains |  | $ (500) |  | $ (300) |  |  | $ (800) | $ 500 | $ (1,800)
Goodwill impairment |  |  |  |  |  |  | 0 |  |
Provision for doubtful accounts |  | 300 |  |  |  |  | 1,500 | 1,800 |
Amortization of acquired technologies | $ 1,037 | $ 2,700 | $ 6,132 | $ 5,700 | $ 3,741 | $ 11,876 | 24,257 | 24,067 | 26,428
Advertising expense |  |  |  |  |  |  | $ 13,903 | $ 12,774 | $ 11,576

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