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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |
Summary of Stock Option Activity | A summary of stock option activity under the 20 12 Plan, including 1,061,250 stock options that were granted outside of the 20 12 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 |
Balance as of December 31, 2020 |  |  | 62,827,150 |  |  | $ | 4.55 |  |  |  | 7.8 |  |  | $ | 1,208.0 |
Granted |  |  | 3,375,940 |  |  |  | 13.89 |  |  |  |  |  |  |  |  |
Exercised |  |  | (9,318,462 | ) |  |  | 2.89 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (2,359,089 | ) |  |  | 6.87 |  |  |  |  |  |  |  |  |
Balance as of December 31, 2021 |  |  | 54,525,539 |  |  | $ | 5.30 |  |  |  | 7.1 |  |  | $ | 221.3 |
Excercisable and vested at December 31, 2021 |  |  | 34,618,347 |  |  | $ | 4.02 |  |  |  | 6.3 |  |  | $ | 176.6 |
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 |
Balance as of December 31, 2020 |  |  | 32,556,160 |  |  | $ | 6.75 |
Granted |  |  | 41,969,138 |  |  |  | 13.30 |
Vested and converted to common stock |  |  | (15,779,232 | ) |  |  | 10.21 |
Forfeited |  |  | (4,228,136 | ) |  |  | 13.20 |
Balance as of December 31, 2021 |  |  | 54,517,930 |  |  | $ | 10.29 |
Summary of Share-based Payment Arrangement, Expensed and Capitalized, Amount | Total stock-based compensation expense included in the consolidated statement of operations is as follows (in millions):
|  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Commissions and other related expense |  | $ | 128.7 |  |  | $ | 5.7 |  |  | $ | 16.1 |
Sales and marketing |  |  | 38.4 |  |  |  | 16.0 |  |  |  | 11.1 |
Operations and support |  |  | 16.9 |  |  |  | 3.5 |  |  |  | 2.4 |
Research and development |  |  | 92.7 |  |  |  | 1.4 |  |  |  | 2.8 |
General and administrative |  |  | 109.6 |  |  |  | 16.6 |  |  |  | 5.0 |
Total stock-based compensation expense |  | $ | 386.3 |  |  | $ | 43.2 |  |  | $ | 37.4 |
Summary of share-based payment Award, Stock Options, valuation assumptions | The inputs used below are subjective and require significant judgement to determine.
|  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Expected term (in years) |  |  | 6.3 |  |  |  | 7.0 |  |  |  | 5.9 |
Risk-free interest rate |  |  | 0.9 | % |  |  | 0.8 | % |  |  | 2.3 | %
Expected volatility |  |  | 49.3 | % |  |  | 45.1 | % |  |  | 45.0 | %
Dividend rate |  |  | — | % |  |  | — | % |  |  | — | %
Fair value of common stock (range for the period) |  | $ | 8.80 - $18.00 |  |  | $ | 6.65 - $23.44 |  |  | $ | 5.16 - $6.44 |
Weighted average grant date fair value of options granted |  | $ | 8.68 |  |  | $ | 5.67 |  |  | $ | 2.62 |
IPO [Member] |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |
Summary of Share-based Payment Arrangement, Expensed and Capitalized, Amount | The Company has not recognized any tax benefits from stock-based compensation as a result of the full valuation allowance maintained on its deferred tax assets.

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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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