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STOCK-BASED COMPENSATION (Tables) | 3 Months Ended
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Mar. 31, 2022
Share-based Payment Arrangement [Abstract] |
Schedule of Non-cash Compensation Related to Equity Awards | Non-cash compensation related to equity awards is included in the following line items in the accompanying consolidated statements of operations and comprehensive income (in thousands):
|  |  | Three Months Ended March 31,
|  |  |  |  | 2022 |  | 2021
Cost of revenue |  |  |  |  | $ | 393 |  |  | $ | 397 |
Selling and marketing expense |  |  |  |  | 2,039 |  |  | 1,802 |
General and administrative expense |  |  |  |  | 9,600 |  |  | 12,171 |
Product development |  |  |  |  | 1,965 |  |  | 2,066 |
Restructuring and severance |  |  |  |  | 1,083 |  |  | — |
Total non-cash compensation |  |  |  |  | $ | 15,080 |  |  | $ | 16,436 |
Summary of Changes in Outstanding Stock Options | A summary of changes in outstanding stock options is as follows:
| Number of Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value(a)
|  |  | (per option) |  | (in years) |  | (in thousands)
Options outstanding at January 1, 2022 | 676,293 |  |  | $ | 169.71 |  |  |  |  |
Granted (b) | 130,428 |  |  | 114.28 |  |  |  |  |
Exercised | — |  |  | — |  |  |  |  |
Forfeited | (10,010) |  |  | 258.09 |  |  |  |  |
Expired | (811) |  |  | 278.83 |  |  |  |  |
Options outstanding at March 31, 2022 | 795,900 |  |  | 159.41 |  |  | 5.85 |  | $ | 25,773 |
Options exercisable at March 31, 2022 | 485,638 |  |  | $ | 126.88 |  |  | 3.77 |  | $ | 24,985 |
(a)The aggregate intrinsic value represents the total pre-tax intrinsic value (the difference between the Company's closing stock price of $119.67 on the last trading day of the quarter ended March 31, 2022 and the exercise price, multiplied by the number of shares covered by in-the-money options) that would have been received by the option holder had the option holder exercised these options on March 31, 2022. The intrinsic value changes based on the market value of the Company's common stock. (b)During the three months ended March 31, 2022, the Company granted stock options to certain employees with a weighted average grant date fair value per share of $58.60, calculated using the Black-Scholes option pricing model, with a vesting period of three years from grant date.
Schedule of Stock Option Valuation Assumptions | For purposes of determining stock-based compensation expense, the weighted average grant date fair value per share of the stock options was estimated using the Black-Scholes option pricing model, which requires the use of various key assumptions. The weighted average assumptions used are as follows:
Expected term (1) | 6.00 years
Expected dividend (2) | — |
Expected volatility (3) | 53 - 56%
Risk-free interest rate (4) | 1.62 - 1.79%
(1)The expected term of stock options granted was calculated using the "Simplified Method," which utilizes the midpoint between the weighted average time of vesting and the end of the contractual term. This method was utilized for the stock options due to a lack of historical exercise behavior by the Company's employees. (2)For all stock options granted in 2022, no dividends are expected to be paid over the contractual term of the stock options, resulting in a zero expected dividend rate. (3)The expected volatility rate is based on the historical volatility of the Company's common stock. (4)The risk-free interest rate is specific to the date of grant. The risk-free interest rate is based on U.S. Treasury yields for notes with comparable expected terms as the awards, in effect at the grant date.
Summary of Changes in Outstanding Stock Options with Market Conditions | A summary of changes in outstanding stock options with market conditions at target is as follows:
| Number of Options with Market Conditions |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value(a)
|  |  | (per option) |  | (in years) |  | (in thousands)
Options outstanding at January 1, 2022 | 700,209 |  |  | $ | 236.01 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised | — |  |  | — |  |  |  |  |
Forfeited | — |  |  | — |  |  |  |  |
Expired | (13,163) |  |  | 378.95 |  |  |  |  |
Options outstanding at March 31, 2022 | 687,046 |  |  | 233.27 |  |  | 6.51 |  | $ | — |
Options exercisable at March 31, 2022 | — |  |  | $ | — |  |  | 0.00 |  | $ | — |
(a)The aggregate intrinsic value represents the total pre-tax intrinsic value (the difference between the Company's closing stock price of $119.67 on the last trading day of the quarter ended March 31, 2022 and the exercise price, multiplied by the number of shares covered by in-the-money options) that would have been received by the option holder had the option holder exercised these options on March 31, 2022. The intrinsic value changes based on the market value of the Company's common stock.
Summary of Changes in Outstanding Nonvested Restricted Stock Units | A summary of changes in outstanding nonvested restricted stock units ("RSUs") is as follows:
| RSUs
| Number of Units |  | Weighted Average Grant Date Fair Value
|  |  | (per unit)
Nonvested at January 1, 2022 | 308,068 |  |  | $ | 226.55 |
Granted | 321,998 |  |  | 113.55 |
Vested | (75,786) |  |  | 280.44 |
Forfeited | (26,687) |  |  | 215.35 |
Nonvested at March 31, 2022 | 527,593 |  |  | $ | 150.41 |
Summary of Changes in Outstanding Nonvested RSUs with Performance Conditions, Nonvested RSAs with Performance Conditions and Nonvested RSAs with Market Conditions | A summary of changes in outstanding nonvested RSAs with market conditions at target is as follows:
| RSAs with Market Conditions
| Number of Awards |  | Weighted Average Grant Date Fair Value
|  |  | (per unit)
Nonvested at January 1, 2022 | 26,674 |  |  | $ | 340.25 |
Granted | — |  |  | — |
Vested | — |  |  | — |
Forfeited | — |  |  | — |
Nonvested at March 31, 2022 | 26,674 |  |  | $ | 340.25 |
Summary of Employee Stock Purchase Plan Valuation Assumptions | For purposes of determining stock-based compensation expense, the grant date fair value per share estimated using the Black-Scholes option pricing model required the use of the following key assumptions:
Expected term (1) | 0.50 years
Expected dividend (2) | — |
Expected volatility (3) | 49 | %
Risk-free interest rate (4) | 0.19 | %
(1)The expected term was calculated using the time period between the grant date and the purchase date. (2)No dividends are expected to be paid, resulting in a zero expected dividend rate. (3)The expected volatility rate is based on the historical volatility of the Company's common stock. (4)The risk-free interest rate is specific to the date of grant. The risk-free interest rate is based on U.S. Treasury yields for notes with comparable expected terms as the employee stock purchase rights, in effect at the grant date.

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