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SHARE-BASED AWARDS (Tables)
6 Months Ended
Jun. 30, 2023
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, 2023, 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, 202210,712 $2.13 3.5$
Exercised(2,170)1.05 
Expired(331)2.91 
Balance-June 30, 20238,211 $2.39 3.7$14 
Exercisable-June 30, 20238,211 $2.39 3.7$14 
Summary of the RSU Activity
A summary of the RSU activity for the six months ended June 30, 2023, is as follows:
Number of
RSUs
(in thousands)
Weighted-
Average
Grant-Date
Fair Value
Unvested and outstanding-December 31, 202254,547 $10.29 
Granted42,600 1.64 
Vested(17,136)5.65 
Forfeited(11,017)12.53 
Unvested and outstanding-June 30, 202368,994 $4.30 
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.
Six Months Ended
June 30, 2023
Fair value
$0.64 – $0.81
Volatility
119%
Risk-free rate
  5.06% – 5.20%
Expected life (in years)
0.5 – 1.0
Expected dividend$— 
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, 2023 and 2022 (in millions):
Three Months Ended
June 30,
Six Months Ended
June 30,
2023202220232022
General and administrative$$43 $32 $94 
Sales, marketing and operations
Technology and development12 11 23 23 
Total stock-based compensation expense$21 $59 $63 $126