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STOCK-BASED AWARDS (Tables)
9 Months Ended
Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock Option Activity
A summary of stock option activity for the nine months ended September 30, 2024 was as follows:
Outstanding Options
Number of OptionsWeighted Average Exercise PriceWeighted-Average Remaining Contractual Term
Intrinsic Value
(in thousands)
Balance as of December 31, 2023
32,911,135 $1.99 5.5$91,785 
Options granted
232,177 3.99 
Options exercised
(2,896,364)1.12 
Options canceled
(1,401,707)6.83 
Balance as of September 30, 2024
28,845,241 $1.86 4.61$65,140 
Options vested and exercisable as of September 30, 2024
26,103,849 $1.33 4.47$64,972 
Schedule of Restricted Stock Units Activity
A summary of RSUs activity for the nine months ended September 30, 2024 was as follows:
Restricted Stock Units
Time-Based SharesPerformance-Based SharesTotal SharesWeighted-Average Grant-Date Fair Value
Balance as of December 31, 2023
54,699,739 9,305,825 64,005,564 $10.90 
Granted88,542,220 13,772,614 102,314,834 2.88 
Vested(31,636,368)(1,644,016)(33,280,384)8.34 
Cancelled/Forfeited(11,785,855)(5,079,726)(16,865,581)7.02 
Balance as of September 30, 2024
99,819,736 16,354,697 116,174,433 $5.13 
Schedule of Performance-Based RSUs The fair value of these performance-based RSUs was measured on the grant date, March 27, 2021, using a Monte Carlo simulation model, with the following assumptions:
Weighted average volatility60.0 %
Expected term (in years)5.0
Risk-free interest rate0.9 %
Expected dividends— %
Schedule of Stock-Based Compensation Expense
Total employee and nonemployee stock-based compensation expense for the three and nine months ended September 30, 2024 and 2023, was classified in the condensed consolidated statements of operations and comprehensive loss as follows (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2024202320242023
Cost of revenue$1,145 $1,221 $2,956 $2,560 
Research and development53,663 35,963 124,722 101,356 
Selling, general and administrative33,286 31,053 82,605 90,959 
Restructuring charges
— — (1,480)(1,443)
Total$88,094 $68,237 $208,803 $193,432