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Revenue from Contract with Customers - Summary of disaggregation of revenue (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]        
Revenue $ 96,667 $ 76,061 $ 358,342 $ 273,610
US        
Disaggregation of Revenue [Line Items]        
Revenue 83,661 [1] 71,059 [1] 309,211 [2] 237,712 [2]
International        
Disaggregation of Revenue [Line Items]        
Revenue 13,006 5,002 49,131 35,898
Mobile        
Disaggregation of Revenue [Line Items]        
Revenue 70,004 53,159 257,405 184,755
Web        
Disaggregation of Revenue [Line Items]        
Revenue $ 26,663 $ 22,902 $ 100,937 $ 88,855
[1] Geographic location is presented as being derived from the U.S. when data is not available.
[2] Geographic location is presented as being derived from the U.S. when data is not available