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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2022
Share-based Payment Arrangement [Abstract]  
Summary of Stock Option Activity
A summary of the Company’s stock option activity under the SI Plan is as follows:
Number of
Options		Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual Life (Years)		Aggregate
Intrinsic
Value
Outstanding as of December 31, 2021
— 
Granted4,347,492 5.15 
Exercised— 
Cancelled/forfeited— 
Outstanding as of March 31, 2022
4,347,492 $5.15 9.79$498 
A summary of the Company’s stock option activity under the EI Plan is as follows:
Number of
Options		Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual Life (Years)		Aggregate
Intrinsic
Value
Outstanding as of December 31, 2021
31,962,921 $2.81 7.77$86,075 
Granted— 
Exercised(268,702)2.50 729 
Cancelled/forfeited(1,049,835)3.40 
Outstanding as of March 31, 2022
30,644,384 $2.79 7.34$73,051 
A summary of the Company’s stock option activity under the STI Plan is as follows:
Number of
Options		Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual Life (Years)		Aggregate
Intrinsic
Value
Outstanding as of December 31, 2021
9,526,727 $5.55 8.0$13,905 
Granted— 
Exercised(492,973)2.41 1,037 
Cancelled/forfeited(243,815)8.02 
Outstanding as of March 31, 2022
8,789,939 $5.74 8.4$10,759 
Summary of Weighted-Average Assumptions
The weighted-average assumptions used in the Black-Scholes option pricing model for awards granted during the three months ended March 31, 2022 are as follows:
Risk-free interest rate:1.61 %
Expected term (in years):7.01
Expected volatility:43.50 %
Dividend yield:0.00 %
Schedule of Stock-Based Compensation Expense
The following table presents stock-based compensation expense included in each respective expense category in the unaudited Condensed Consolidated Statements of Operations and Other Comprehensive Loss:
Three Months Ended March 31,
20222021
Research and development$1,622 $591 
Sales and marketing374 199 
General and administrative1,350 1,730 
$3,347 $2,520