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Equity Incentive Plans (Tables)
 9 Months Ended
Sep. 30, 2022
Share-Based Payment Arrangement [Abstract]  
Schedule of Share-based Payment Arrangement, Option, Activity
Stock option activity under the Plan and the 2017 Plan was as follows:
Stock options outstanding
Number of
shares		Weighted
average
exercise price		Weighted average remaining contractual term (in years)Aggregate intrinsic value
Balance, December 31, 2021
79,644,550 $1.44 
Granted6,748,081 2.69 
Exercised
(19,002,590)0.63 
Forfeited
(4,144,285)2.49 
Balance, September 30, 2022
63,245,756 $1.75 7.1$51,428 
Exercisable, September 30, 2022
42,496,184 $1.32 6.4$46,398 
Schedule of Restricted Stock Unit Activity
RSU activity under the Plan and the 2017 Plan was as follows:
Unvested RSUs outstanding
Number of
shares		Weighted-
average grant
date fair value
Balance, December 31, 2021
34,054,713 $4.72 
Granted
106,875,524 3.74 
Vested(20,544,459)4.31 
Forfeited
(12,611,734)4.35 
Balance, September 30, 2022
107,774,044 $3.86 
Schedule of Stock-Based Compensation Expense
Total stock-based compensation expense by function was as follows:
Three Months Ended
September 30,		Nine Months Ended
September 30,
2022202120222021
Research and development
$31,592 $38,015 $99,243 $112,329 
Selling, general, and administrative
5,213 1,952 13,087 6,076 
Total
$36,805 $39,967 $112,330 $118,405