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SHARE-BASED AWARDS (Tables)
6 Months Ended
Jun. 30, 2022
Share-Based Payment Arrangement [Abstract]  
Summary of the Stock Option Activity
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, 202114,546 $2.12 4.7$182 
Granted— — 
Exercised(2,321)1.33 
Forfeited(278)4.05 
Expired(225)0.76 
Balance-June 30, 202211,722 $2.26 4.0$30 
Exercisable-June 30, 202211,119 $2.02 3.9$30 
Summary of the RSU Activity
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, 202153,446 $17.35 
Granted16,752 8.16 
Vested(8,543)10.60 
Forfeited(3,832)13.15 
Unvested and outstanding-June 30, 202257,823 $15.97 
Summary of the Restricted Shares Activity
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, 2021692 $3.91 
Granted— — 
Vested(138)3.02 
Unvested-June 30, 2022554 $4.13 
Summary of Assumptions Used in the Black-Scholes Model for Employee and non-Employee Stock Options
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$3.55 
Volatility101.4 %
Risk-free rate0.60 %
Expected life (in years)0.5
Expected dividend$— 
Summary of Stock-Based Compensation Expense in the Statements of Operations
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,
2022202120222021
General and administrative$43 $156 $94 $353 
Sales, marketing and operations
Technology and development11 23 42 
Total stock-based compensation expense$59 $164 $126 $403