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Operating Segments and Geographic Information - Schedule of Revenue by Geographic Area (Details) (10-K) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues $ 302,871 $ 263,518 $ 228,294
United States, country of domicile      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 144,776 125,682 105,774
United Kingdom      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 31,649 28,422 26,199
All other international      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues $ 126,446 $ 109,414 $ 96,321