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STOCK-BASED AWARDS (Tables)
 9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Share-based Payment Arrangement, Option, Activity A summary of stock option activity is as follows:
Outstanding Options
Number of Options
Weighted Average Exercise Price
Weighted-Average Remaining Contractual Term
Intrinsic Value (in thousands)
Balance—December 31, 202070,675,318 $0.84 7.8$647,218 
Options granted
8,402,925 2.85 
Options exercised
(8,966,272)0.69 
Options canceled
(3,098,349)1.68 
Balance—September 30, 202167,013,622 $1.07 6.8$1,628,923 
Options vested and exercisable September 30, 202141,932,824 $0.75 5.7$1,032,660 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions A summary of the assumptions the Company utilized to record compensation expense for stock options granted during the three and nine months ended September 30, 2021 and 2020, is as follows:
Three Months Ended
September 30,		Nine Months Ended
September 30,
2021202020212020
Weighted average volatility
—%50.4%41.9%65.2%
Expected term (in years)
0.05.85.95.9
Risk-free interest rate
—%1.6%0.6%0.9%
Expected dividends
$— $— $— $— 
Schedule of Nonvested Restricted Stock Units Activity
A summary of RSU award activity is as follows:
Restricted Stock Units
Time-Based SharesPerformance-Based SharesTotal SharesWeighted-Average Grant-Date Fair Value
Nonvested balance as of December 31, 2020— — — $— 
Granted27,500,001 16,024,411 43,524,412 19.41 
Cancelled/Forfeited(341,135)— (341,135)22.79 
Nonvested balance as of September 30, 202127,158,866 16,024,411 43,183,277 $19.38 
Schedule of Share-based Compensation Arrangements by Share-based Payment Award 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 Share-based Payment Arrangement, Expensed and Capitalized, Amount
Total employee and nonemployee stock-based compensation expense for the three and nine months ended September 30, 2021 and 2020, is classified in the consolidated statements of operations as follows (in thousands):
Three Months Ended
September 30,		Nine Months Ended
September 30,
2021202020212020
Research and development$59,196 $679 $85,899 $2,072 
Selling, general and administrative177,760 597 280,301 1,185 
Total$236,956 $1,276 $366,200 $3,257