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Basis of presentation and Summary of Significant accounting Policies - Summary of Percentage of Revenues (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Revenue Concentration | Apple |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 51.30% | 50.00% | 50.80% | 48.10%
Revenue Concentration | Facebook |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 26.80% | 29.10% | 27.30% | 31.20%
Revenue Concentration | Google |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 19.00% | 17.90% | 18.90% | 17.20%
Accounts Receivable Concentration | Apple |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 67.20% | 54.10% | 54.10% | 53.60%
Accounts Receivable Concentration | Facebook |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 18.00% | 25.90% | 25.90% | 28.00%
Accounts Receivable Concentration | Google |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 13.60% | 18.00% | 18.00% | 16.80%

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