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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Option Activity
A summary of the stock option activity is as follows:

Number of
options
Weighted
average
exercise
price
Weighted
average
remaining
contractual
life
Aggregate
intrinsic
value
(In thousands)(In years)(In thousands)
Balance as of December 31, 202033,750 $1.74 7.95$175,444 
Granted13,790 12.29 
 
 
Exercised(12,988)1.95 
 
 
Cancelled and forfeited(2,877)6.51 
 
 
Balance as of December 31, 202131,675 $5.81 8.01$108,826 
Vested and exercisable as of December 31, 202111,067 $2.18 6.72$61,011 
Schedule of Valuation Assumptions
The estimated grant date fair values of the employee stock options granted under the 2012 and 2021 Plan were calculated using the Black-Scholes Merton Option pricing model, based on the following weighted average assumptions:

Year Ended December 31,
202120202019
Expected term (years)5.935.906.24
Expected volatility32.85%35.14%38.83%
Risk-free interest rate1.04%0.58%1.97%
Expected dividend yield
The estimated fair value of the first tranche as of the modification date was determined using Black-Scholes Merton Option pricing model, which resulted in fair value of $12.27 per share based on the following assumptions:

Fair value of common stock$18.00
Expected term (years)7.44
Expected volatility45.00%
Risk-free interest rate1.71%
Expected dividend yield

The remaining tranches were valued using a Monte Carlo simulation model. The weighted average estimated fair value of the remaining tranches as of the modification date was $3.80 per share based on the following assumptions:

Fair value of common stock$18.00
Remaining contractual term (years)14.75
Expected volatility40.00%
Risk-free interest rate1.71%
Expected dividend yield
Schedule of RSU Activity
A summary of the Company’s RSU activity and related information is as follows:

Number of RSUs
Weighted
average
grant date fair value per share
(In thousands)
Balance as of December 31, 2020— $— 
Granted2,717 9.15 
Vested(108)13.94 
Cancelled and forfeited(20)13.89 
Balance as of December 31, 20212,589 $8.91 
Schedule of Stock Based Compensation Expense
The Company’s stock-based compensation expense was as follows:

Year Ended December 31,
202120202019
(In thousands)
Cost of revenue$753 $79 $46 
Research and development13,184 4,250 3,431 
Sales and marketing7,167 3,675 966 
General and administrative49,740 2,120 5,446 
Total$70,844 $10,124 $9,889 
Included in stock-based compensation expense are amounts related to the sale of employee stock on the secondary market to existing investors at a price above fair market value at the time of the sale. Stock-based compensation related to the secondary sales, which represents the amount paid to purchase shares of the Company’s common stock in excess of fair value, was as follows:
Year Ended December 31,
202120202019
(In thousands)
Research and development$325 $1,524 $1,694 
Sales and marketing300 1,607 96 
General and administrative166 325 4,372 
Total$791 $3,456 $6,162