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Summary of Significant Accounting Policies - Deferred Revenue (Details) (10-K) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accounting Policies [Abstract] |  |  |  |
Revenue, advance billing period |  | 12 months |  |
Change In Contract With Customer, Liability [Roll Forward] |  |  |  |
Beginning balance | $ 9,670 | $ 9,670 | $ 8,172 | $ 8,491
Deferred revenue recognized | (4,090) |  | (13,619) | (13,345)
Additional amounts deferred | 4,245 |  | 15,117 | 14,217
Deferred revenue acquired in business combinations |  |  |  | 34
Ending balance | $ 9,825 | $ 9,582 | $ 9,670 | 8,172
Adoption of ASC 606 |  |  |  |
Change In Contract With Customer, Liability [Roll Forward] |  |  |  |
Beginning balance |  |  |  | $ (1,225)

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