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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 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
— 
Granted6,632,387 3.68 
Exercised— — 
Cancelled/forfeited(469,181)5.32 
Outstanding as of September 30, 2022
6,163,206 $3.56 9.55$— 
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(1,606,795)2.52 3,658 
Cancelled/forfeited(5,083,652)2.57 
Outstanding as of September 30, 2022
25,272,474 $2.82 7.17$74 
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(2,181,335)2.5 1,678 
Cancelled/forfeited(888,381)8.04 
Outstanding as of September 30, 2022
6,457,011 $6.51 7.99$— 
Summary of Weighted-Average Assumptions
The weighted-average assumptions used in the Black-Scholes option pricing model for awards granted during the nine months ended September 30, 2022 are as follows:
September 30, 2022September 30, 2021
Risk-free interest rate:2.46 %0.79 %
Expected term (in years):7.166.05
Expected volatility:42.17 %42.10 %
Dividend yield:0.00 %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 September 30,Nine Months Ended September 30,
2022202120222021
Research and development$2,311 $1,879 $7,012 $2,873 
Sales and marketing301 538 926 847 
General and administrative707 2,636 1,855 4,801 
$3,319 $5,053 $9,793 $8,521