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Stock Based Compensation (Tables)
12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of weighted-average assumptions used for stock option awards
The assumptions used in the Company's valuation are summarized as follows, presented on a weighted average basis:

Year Ended December 31, 2021Year Ended December 31, 2020
Risk-free interest rate1.05 %0.29 %
Expected term (in years)5.75.9
Expected volatility74.5 %71.9 %
Expected annual dividends per share— %— %
Schedule of stock option activity
The following table summarizes the Company's stock option activity for the year ended December 31, 2021:     
Number of share optionsWeighted average exercise priceWeighted average remaining contractual termAggregate intrinsic value
Outstanding as of December 31, 20203,672,968 $2.90 8.9 years$6,641 
     Granted13,262,016 $5.76 
     Forfeited(2,012,851)$3.61 
     Exercised(1,124,577)$2.74 
Outstanding as of December 31, 202113,797,556 $5.55 8.6 years$712 
Outstanding as of December 31, 2021 - vested and expected to vest12,685,817 $5.51 8.6 years$709 
Exercisable at December 31, 20211,598,709 $3.60 7.2 years$406 
Schedule of RSU activity The following table summarizes the activity relating to RSUs for the year ended December 31, 2021:
Number of SharesWeighted Average Grant Date Fair Value
RSUs - beginning of period26,923 $1.60 
Vested(26,923)$1.60 
RSUs - end of period— $— 
Schedule of stock-based compensation expense
Stock‑based compensation expense related to stock options is recorded within the consolidated statements of operations and comprehensive loss as follows:
Year Ended December 31, 2021Year Ended December 31, 2020
Research and development
$5,909 $749 
General and administrative
6,895 1,017 
Total stock-based compensation
$12,804 $1,766