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SHARE-BASED AWARDS | 6 Months Ended
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Jun. 30, 2022
Share-Based Payment Arrangement [Abstract] |
SHARE-BASED AWARDS | SHARE-BASED AWARDS Stock options and RSUs Option awards are generally granted with an exercise price equal to the fair value of the Company’s common stock at the date of grant. Options are exercisable over a maximum term of 10 years from the date of grant and generally vest over a period of four years. Incentive stock options granted to a 10% shareholder are exercisable over a maximum term of five years from the date of grant. A summary of the stock option activity for the six months ended June 30, 2022, is as follows:
| Number of Options (in thousands) |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in millions)
Balance-December 31, 2021 | 14,546 |  |  | $ | 2.12 |  |  | 4.7 |  | $ | 182 |
Granted | — |  |  | — |  |  |  |  |
Exercised | (2,321) |  |  | 1.33 |  |  |  |  |
Forfeited | (278) |  |  | 4.05 |  |  |  |  |
Expired | (225) |  |  | 0.76 |  |  |  |  |
Balance-June 30, 2022 | 11,722 |  |  | $ | 2.26 |  |  | 4.0 |  | $ | 30 |
Exercisable-June 30, 2022 | 11,119 |  |  | $ | 2.02 |  |  | 3.9 |  | $ | 30 |
Prior to 2021, certain awards also had a performance condition to vesting, which was satisfied upon completion of the February 2021 Offering and triggered the recognition of compensation expense for certain RSUs for which the time-based vesting condition had been satisfied or partially satisfied. Subsequent to the February 2021 Offering, these RSUs are only subject to time-based vesting conditions. A summary of the RSU activity for the six months ended June 30, 2022, is as follows:
| Number of RSUs (in thousands) |  | Weighted- Average Grant-Date Fair Value
Unvested and outstanding-December 31, 2021 | 53,446 |  |  | $ | 17.35 |
Granted | 16,752 |  |  | 8.16 |
Vested | (8,543) |  |  | 10.60 |
Forfeited | (3,832) |  |  | 13.15 |
Unvested and outstanding-June 30, 2022 | 57,823 |  |  | $ | 15.97 |
Restricted Shares The Company has granted Restricted Shares to certain continuing employees, primarily in connection with acquisitions. The Restricted Shares vest upon satisfaction of a service condition, which generally ranges from three to four years. A summary of the Restricted Shares activity for the six months ended June 30, 2022 is as follows:
| Number of Restricted Shares (in thousands) |  | Average Grant-Date Fair Value
Unvested-December 31, 2021 | 692 |  |  | $ | 3.91 |
Granted | — |  |  | — |
Vested | (138) |  |  | 3.02 |
Unvested-June 30, 2022 | 554 |  |  | $ | 4.13 |
ESPP The first offering period for the Company's 2020 ESPP began on March 1, 2022. The ESPP, pursuant to Internal Revenue Code Section 423, allows eligible participants to purchase shares using payroll deductions of up to 15% of their total compensation, subject to a $25,000 calendar year limitation on contributions. The Company has limited the maximum number of shares to be purchased in an offering period to 1,000 shares per employee. The ESPP allows eligible employees to purchase shares of the Company’s common stock at a 15% discount on the lower price of either (i) the offer period start date or (ii) the purchase date. Each offering period is six months in duration. ESPP employee payroll contributions withheld as of June 30, 2022 were $2 million and are included within Accounts payable and other accrued liabilities in the condensed consolidated balance sheets. Payroll contributions withheld as of June 30, 2022 will be used to purchase shares at the end of the current ESPP purchase period ending on August 31, 2022. The fair value of ESPP purchase rights is estimated at the date of grant using the Black-Scholes option-pricing valuation model. The following assumptions were applied in the model to estimate the grant-date fair value of the ESPP for the initial offering period that began on March 1, 2022.
| 2022
Fair value | $ | 3.55 |
Volatility | 101.4 | %
Risk-free rate | 0.60 | %
Expected life (in years) | 0.5
Expected dividend | $ | — |
As of June 30, 2022, total estimated unrecognized compensation expense related to the ESPP was $0.5 million. That cost is expected to be recognized over the remaining term of the offering period of 2 months. Stock-based compensation expense Stock-based compensation expense is allocated based on the cost center to which the award holder belongs. The following table summarizes total stock-based compensation expense by function as presented in the condensed consolidated statements of operations for the three and six months ended June 30, 2022 and 2021, as follows (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2022 |  | 2021 |  | 2022 |  | 2021
General and administrative | $ | 43 |  |  | $ | 156 |  |  | $ | 94 |  |  | $ | 353 |
Sales, marketing and operations | 5 |  |  | 1 |  |  | 9 |  |  | 8 |
Technology and development | 11 |  |  | 7 |  |  | 23 |  |  | 42 |
Total stock-based compensation expense | $ | 59 |  |  | $ | 164 |  |  | $ | 126 |  |  | $ | 403 |
During the six months ended June 30, 2022, no market condition awards satisfied their market condition. As of June 30, 2022, there was $580 million of unamortized stock-based compensation costs related to unvested RSUs, stock options, and Restricted Shares. The unamortized compensation costs are expected to be recognized over a weighted-average period of approximately 2.6 years.

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