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Stockholders' Equity - Summary of Stock Option Award Activity (Details) - Stock Options - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Weighted-Average Exercise Price |  |
Weighted-Average Exercise Price, Beginning balance | $ 10.37 |
Weighted-Average Exercise Price, Exercised | 13.98 |
Weighted-Average Exercise Price, Ending balance | $ 10.16 | $ 10.37
Weighted-Average Remaining Contractual Term |  |
Weighted-Average Remaining Contractual Term (in years) | 4 years 9 months 3 days | 5 years 2 months 12 days
Aggregate Intrinsic Value |  |
Aggregate Intrinsic Value, Outstanding | $ 223,515 | $ 223,230
Class A Common Stock |  |
Number of Shares |  |
Number of Shares, Beginning balance | 4,828 |
Number of Shares, Exercised | (314) |
Number of Shares, Ending balance | 4,514 | 4,828
Class B Common Stock |  |
Number of Shares |  |
Number of Shares, Beginning balance | 796 |
Number of Shares, Exercised | (5) |
Number of Shares, Ending balance | 791 | 796

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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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