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SHARE-BASED AWARDS (Tables)
 9 Months Ended
Sep. 30, 2022
Share-Based Payment Arrangement [Abstract]  
Summary of the Stock Option Activity
A summary of the stock option activity for the nine months ended September 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(2,892)1.36 
Forfeited(344)4.08 
Expired(227)0.77 
Balance-September 30, 202211,083 $2.28 3.9$13 
Exercisable-September 30, 202210,824 $2.13 3.8$13 
Summary of the RSU Activity
A summary of the RSU activity for the nine months ended September 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 
Granted28,735 6.80 
Vested(12,958)11.85 
Forfeited(6,894)12.46 
Unvested and outstanding-September 30, 202262,329 $14.17 
Summary of the Restricted Shares Activity
A summary of the Restricted Shares activity for the nine months ended September 30, 2022 is as follows:
Number of
Restricted Shares
(in thousands)
Average
Grant-Date
Fair Value
Unvested-December 31, 2021692 $3.91 
Vested(138)3.02 
Forfeited(69)3.02 
Unvested-September 30, 2022485 $4.29 
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.
Offering Period
September 1, 2022 - February 28, 2023March 1, 2022 - August 31, 2022
Fair value$1.78 $3.55 
Volatility94.5 %101.4 %
Risk-free rate3.34 %0.60 %
Expected life (in years)0.50.5
Expected dividend$— $— 
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 nine months ended September 30, 2022 and 2021, as follows (in millions):
Three Months Ended
September 30,		Nine Months Ended
September 30,
2022202120222021
General and administrative$38 $52 $132 $405 
Sales, marketing and operations5 2 14 10 
Technology and development9 8 32 50 
Total stock-based compensation expense$52 $62 $178 $465