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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2022
Share-based Payment Arrangement [Abstract] |
Schedule of Stock Option Activity | The following is a summary of the Company’s stock option activity during the year ended December 31, 2022:
| Stock Options
(in thousands, except share and per share amounts) | Number of Options Outstanding |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value (1)
Balances as of January 1, 2022 | 23,386,942 |  |  | $ | 3.70 |  |  | 7.66 |  | $ | 395,676 |
Granted | 166,113 |  |  | 11.15 |  |  |  |  |
Exercised | (5,379,722) |  |  | 2.15 |  |  |  |  | 43,975 |
Forfeited | (2,185,065) |  |  | 5.08 |  |  |  |  |
Balances as of December 31, 2022 | 15,988,268 |  |  | 4.11 |  |  | 6.79 |  | 119,467 |
Vested and exercisable as of December 31, 2022 | 9,963,250 |  |  | 2.53 |  |  | 6.01 |  | 88,859 |
Vested and expected to vest as of December 31, 2022 | 16,074,197 |  |  | $ | 4.11 |  |  | 6.80 |  | $ | 120,057 |
_________________ (1)The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying stock options and the estimated fair value of the Company’s common stock.
Schedule of Stock Option Valuation Assumptions | The fair value of each employee stock option granted during the years ended December 31, 2022, 2021, and 2020 was estimated on the date of grant using the Black-Scholes option pricing model with the following assumptions:
| Years Ended December 31,
| 2022 |  | 2021 |  | 2020
Risk-free interest rates | 2.86% |  | 0.32% to 1.19% |  | 0.30% to 1.47%
Expected term (in years) | 6.1 years |  | 3.5 to 6.8 years |  | 5.0 to 6.6 years
Volatility | 64.0% |  | 37.8% to 50.5% |  | 37.3% to 54.0%
Dividend rate | — | % |  | — | % |  | — | %
Schedule of Restricted Stock Award Activity | Restricted stock unit activity, including PRSUs, during the year ended December 31, 2022 was as follows:
|  | Number of Shares |  | Weighted-Average Grant-Date Fair Value Per Share
Unvested at January 1, 2022 |  | 3,372,585 |  |  | $ | 24.83 |
Granted |  | 24,527,052 |  |  | 10.65 |
Vested |  | (2,955,066) |  |  | 14.32 |
Cancelled/forfeited |  | (1,578,216) |  |  | 16.24 |
Unvested at December 31, 2022 |  | 23,366,355 |  |  | $ | 11.86 |
Schedule of ESPP Valuation Assumptions | The fair value of the ESPP offerings was estimated using the Black-Scholes option-pricing model as of the respective offering dates, using the following assumptions. These assumptions represent the grant date fair value inputs for new offerings during the years ended December 31, 2022 and 2021, as well as updated valuation information as of the modification date, for any offerings for which a modification occurred, requiring incremental expense to be measured at the modification date:
| Years Ended December 31,
| 2022 |  | 2021 |  |
Risk-free interest rates | 0.60% to 3.48% |  | 0.06% to 0.30% |  |
Expected term (in years) | 0.5 to 2.0 years |  | 0.4 to 1.9 years |  |
Volatility | 58.3% to 73.0% |  | 37.7% to 56.0% |  |
Dividend rate | — | % |  | — | % |  |
Schedule of Share-based Compensation Expense | Stock-based compensation expense for stock options, RSUs, PRSUs, and the ESPP, included within the Consolidated Statements of Operations, net of amounts capitalized to internal-use software, as described in Note 4. Property and Equipment, was as follows:
| Years Ended December 31,
(in thousands) | 2022 |  | 2021 |  | 2020
Customer support and operations | $ | 816 |  |  | $ | 153 |  |  | $ | 22 |
Marketing | 10,512 |  |  | 2,325 |  |  | 869
Technology and development | 46,420 |  |  | 6,931 |  |  | 2,130 |
General and administrative | 37,545 |  |  | 7,607 |  |  | 2,243 |
Total | $ | 95,293 |  |  | $ | 17,016 |  |  | $ | 5,264 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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