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Stock Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award  
Schedule of Share-based Compensation Expense
The following table presents the share-based compensation expense recognized in the periods presented:
Year Ended December 31,
202120202019
Restricted stock units$59,652 $— $— 
Stock options31,231 10,895 6,964 
CEO Long-Term Performance Award38,189 — — 
Employee Stock Purchase Plan1,946 — — 
Secondary sales of common stock11,642 17,316 14,793 
Total$142,660 $28,211 $21,757 
A summary of the Company's RSUs activity under the Plans was as follows:
Number of Restricted Stock UnitsWeighted-average grant date fair value per share
Balance as of December 31, 2019— $— 
Granted4,571,886 4.89 
Vested— — 
Canceled and forfeited(141,550)3.68 
Balance as of December 31, 2020
4,430,336 $4.93 
Granted8,409,821 22.20 
Vested(2,641,196)10.12
Canceled and forfeited(1,197,012)14.23 
Balance as of December 31, 2021
9,001,949 $18.30 
A summary of the Company's stock option activity under the Plans was as follows:
Number of OptionsWeighted-Average Exercise Price per ShareWeighted-Average Remaining Contractual Life (Years)
Aggregate Intrinsic Value(1)
Balance as of January 1, 2019(2)
19,628,032 $0.19 7.69$38,982 
Granted17,008,222 1.30 
Exercised(8,529,478)0.13 
Canceled and forfeited(2,947,365)0.54 
Balance as of December 31, 2019(2)
25,159,411 $0.92 8.74$46,594 
Granted6,404,800 2.31 
Exercised(6,084,183)0.53 
Canceled and forfeited(2,058,654)1.50 
Balance as of December 31, 2020(2)
23,421,374 $1.35 8.33$248,002 
Granted29,113,555 20.07 
Exercised(4,277,344)1.18 
Canceled and forfeited(4,072,097)5.58 
Balance as of December 31, 2021(2)
44,185,488$13.31 8.46$279,242 
Vested as of December 31, 2021
10,007,419$1.53 6.67$157,032 
(1) Intrinsic value based is calculated based on the difference between the exercise price of in-the-money-stock options and the fair value of the common stock as of the respective balance sheet dates.
(2) The 2011 Plan allows for early exercise of stock options and these balances include all exercisable stock options regardless of vesting status.
The CEO Long-Term Performance Award is divided into seven equal tranches which vest upon the achievement of the following Company stock price hurdles:
TrancheCompany Stock Price HurdleNumber of Options Eligible to Vest
1$67.502,826,884
2$78.982,826,884
3$92.402,826,884
4$108.112,826,884
5$126.492,826,884
6$147.992,826,884
7$173.152,826,884
Total19,788,188
Stock Options  
Share-based Compensation Arrangement by Share-based Payment Award  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The fair values of stock options granted were estimated using the Black-Scholes option pricing model and the following weighted-average assumptions:
Year Ended December 31,
202120202019
Dividend yield0.0%0.0%0.0%
Expected volatility52.36%48.11%43.73%
Expected term (in years)6.146.026.02
Risk-free interest rate1.00%0.54%1.92%