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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2021
Summary of Stock Option Award Activity | The following table summarizes the stock option award activity under the Stock Plans during the three months ended March 31, 2021:
|  | Class A Number of Shares |  |  | Class B Number of Shares |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value(1) |
|  | (in thousands, except per share data) |
Outstanding at December 31, 2020 |  |  | 4,828 |  |  |  | 796 |  |  | $ | 10.37 |  |  |  | 5.20 |  |  | $ | 223,230 |
Granted |  |  | — |  |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |
Exercised |  |  | (314 | ) |  |  | (5 | ) |  | $ | 13.98 |  |  |  | — |  |  | $ | — |
Forfeited |  |  | — |  |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |
Outstanding at March 31, 2021 |  |  | 4,514 |  |  |  | 791 |  |  | $ | 10.16 |  |  |  | 4.76 |  |  | $ | 223,515 |
(1) | The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying stock option awards and the closing market price of our Class A common stock as of December 31, 2020 and March 31, 2021, respectively.
Summary of Total Stock-based Compensation Expense | Total stock-based compensation expense by function was as follows:
| Three Months Ended March 31, |
| 2021 |  |  | 2020 |
| (in thousands) |
Cost of revenue | $ | 2,656 |  |  | $ | 1,782 |
Research and development |  | 163,793 |  |  |  | 118,317 |
Sales and marketing |  | 29,084 |  |  |  | 24,806 |
General and administrative |  | 41,540 |  |  |  | 27,144 |
Total | $ | 237,073 |  |  | $ | 172,049 |
Restricted Stock Units and Restricted Stock Awards |
Summary of RSU and RSA Activity | Restricted Stock Units and Restricted Stock Awards The following table summarizes the RSU and RSA activity during the three months ended March 31, 2021:
|  | Class A Outstanding |  |  | Weighted- Average Grant Date Fair Value |
|  | (in thousands, except per share data) |
Unvested at December 31, 2020 |  |  | 131,172 |  |  | $ | 15.10 |
Granted |  |  | 3,252 |  |  | $ | 60.94 |
Vested |  |  | (16,436 | ) |  | $ | 15.02 |
Forfeited |  |  | (3,681 | ) |  | $ | 12.04 |
Unvested at March 31, 2021 |  |  | 114,307 |  |  | $ | 16.51 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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 -Subparagraph (h)(1) -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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 -Subparagraph (d) -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 (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: 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) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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