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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)