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Stock-Based Employee Compensation (Tables) | 9 Months Ended
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Sep. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Stock Option Activity | The following table summarizes the stock option activity for the nine months ended September 30, 2021 (in thousands, except for share and per share amounts):
|  | Number of Options |  |  | Weighted- Average Exercise Price Per Share |  |  | Intrinsic Value |  |  | Weighted- Average Remaining Contractual Term (in years) |
Outstanding, December 31, 2020 |  |  | 9,933,348 |  |  | $ | 2.16 |  |  | $ | 129,358 |  |  |  | 7.80 |
Granted |  |  | 633,700 |  |  |  | 8.10 |  |  |  |  |  |  |
Exercised |  |  | (1,073,448 | ) |  |  | 1.02 |  |  |  |  |  |  |
Forfeited |  |  | (169,975 | ) |  |  | 4.46 |  |  |  |  |  |  |
Expired |  |  | (38,111 | ) |  |  | 2.08 |  |  |  |  |  |  |
Outstanding, September 30, 2021 |  |  | 9,285,514 |  |  | $ | 2.66 |  |  | $ | 141,393 |  |  |  | 7.23 |
Exercisable, September 30, 2021 |  |  | 5,574,039 |  |  | $ | 1.24 |  |  | $ | 92,813 |  |  |  | 6.32 |
Expected to Vest, September 30, 2021 |  |  | 3,711,475 |  |  | $ | 4.79 |  |  | $ | 48,579 |  |  |  | 8.60 |
Summary of restricted stock unit activity | The following table summarizes the restricted stock unit activity for the nine months ended September 30, 2021 (in thousands, except for share and per share amounts):
|  | Number of RSUs |  |  | Weighted- Average Grant-Date Fair Value |
Outstanding, December 31, 2020 |  |  | 250,000 |  |  | $ | 10.52 |
Granted |  |  | 3,178,671 |  |  |  | 22.10 |
Vested |  |  | (178,513 | ) |  |  | 17.83 |
Forfeited |  |  | (10,260 | ) |  |  | 22.46 |
Outstanding, September 30, 2021 |  |  | 3,239,898 |  |  | $ | 21.44 |

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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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- Definition Tabular disclosure of the weighted-average grant-date fair value of equity options or other equity instruments granted during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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