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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2021
Share-based Payment Arrangement [Abstract] |
Summary of Stock Option Activity | A summary of stock option activity under the 2012 Plan and the 2021 Plan, including 1,061,250 stock options that were granted outside of the 2012 Plan in 2019, is presented below (in millions, except share and per share amounts):
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contract Term (in years) |  |  | Aggregate Intrinsic Value |
Balances as of December 31, 2020 |  |  | 62,827,150 |  |  | $ | 4.55 |  |  |  | 7.8 |  |  | $ | 1,208.0 |
Granted |  |  | 1,888,660 |  |  |  | 11.04 |  |  |  |  |  |  |  |  |
Exercised |  |  | (4,710,490 | ) |  |  | 3.05 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (401,930 | ) |  |  | 6.35 |  |  |  |  |  |  |  |  |
Balances as of March 31, 2021 |  |  | 59,603,390 |  |  | $ | 4.86 |  |  |  | 7.7 |  |  | $ | 780.0 |
Exercisable and vested at March 31, 2021 |  |  | 32,491,554 |  |  | $ | 3.47 |  |  |  | 6.6 |  |  | $ | 470.6 |
Summary of Restricted Stock Units Activity | A summary of RSU activity under the 2012 Plan and the 2021 Plan is presented below:
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Balances as of December 31, 2020 |  |  | 32,556,160 |  |  | $ | 6.75 |
Granted |  |  | 18,088,710 |  |  |  | 12.61 |
Vested and converted to common stock |  |  | — |  |  |  | — |
Forfeited |  |  | (371,945 | ) |  |  | 11.80 |
Balances as of March 31, 2021 |  |  | 50,272,925 |  |  | $ | 8.82 |
Summary of Share-based Payment Arrangement, Expensed and Capitalized, Amount | Total stock-based compensation expense included in the condensed consolidated statements of operations is as follows (in millions):
|  | Three Months Ended March 31, 2021 |  |  | Three Months Ended |
|  | IPO Related Expense |  |  | Other Expense |  |  | Total |  |  | March 31, 2020 |
Commissions and other related expense |  | $ | 41.7 |  |  | $ | 2.9 |  |  | $ | 44.6 |  |  | $ | 4.1 |
Sales and marketing |  |  | 1.8 |  |  |  | 7.2 |  |  |  | 9.0 |  |  |  | 2.9 |
Operations and support |  |  | 3.1 |  |  |  | 1.9 |  |  |  | 5.0 |  |  |  | 0.8 |
Research and development |  |  | 46.9 |  |  |  | 2.6 |  |  |  | 49.5 |  |  |  | 0.5 |
General and administrative |  |  | 55.0 |  |  |  | 4.4 |  |  |  | 59.4 |  |  |  | 2.8 |
Total stock-based compensation expense |  | $ | 148.5 |  |  | $ | 19.0 |  |  | $ | 167.5 |  |  | $ | 11.1 |

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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 of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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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