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STOCK-BASED AWARDS (Tables)
 9 Months Ended
Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock Option Activity
A summary of stock option activity for the nine months ended September 30, 2023 was as follows:
Outstanding Options
Number of OptionsWeighted Average Exercise PriceWeighted-Average Remaining Contractual TermIntrinsic Value (in thousands)
Balance as of December 31, 2022
39,011,116 $1.19 6.52$224,721 
Options granted3,534,993 8.40 
Options exercised
(6,827,738)1.07 
Options canceled
(1,398,034)2.41 
Balance as of September 30, 2023
34,320,337 $1.91 5.75$140,380 
Options vested and exercisable as of September 30, 2023
27,690,560 $1.11 5.47$127,260 
Schedule of Restricted Stock Units Activity
A summary of RSUs activity for the nine months ended September 30, 2023 was as follows:
Restricted Stock Units
Time-Based SharesPerformance-Based SharesTotal SharesWeighted-Average Grant-Date Fair Value
Balance as of December 31, 2022
38,570,298 2,090,140 40,660,438 $19.38 
Granted33,708,323 7,362,343 41,070,666 7.29 
Vested(13,613,955)— (13,613,955)16.51 
Cancelled/Forfeited(6,846,819)— (6,846,819)15.19 
Balance as of September 30, 2023
51,817,847 9,452,483 61,270,330 $12.38 
Schedule of Fair Value 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, 2023 and 2022, 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,
2023202220232022
Cost of revenue$1,221 $10,836 $2,560 $29,816 
Research and development35,963 34,083 101,356 123,059 
Selling, general and administrative31,053 38,383 90,959 199,370 
Restructuring charges— — (1,443)— 
Total$68,237 $83,302 $193,432 $352,245