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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2022
Share-Based Payment Arrangement [Abstract]  
Share-based Payment Arrangement, Cost by Plan
Stock-based compensation expense included in the condensed consolidated statements of operations and comprehensive loss was as follows:
Three months ended September 30,Nine months ended September 30,
2022202120222021
Stock options$1,357 $657 $2,778 $3,204 
Restricted stock units 2,259 3,755 8,215 6,881 
Total$3,616 $4,412 $10,993 $10,085 
Summary of Outstanding Stock Option Activity
The following table summarizes stock option activity for the nine months ended September 30, 2022:
 UnitsWeighted-Average
Exercise Price		Weighted-Average
Remaining
Contractual Term
(years)
Options Outstanding at December 31, 20212,023,460 $9.51 6.3
Granted2,950,224 $1.31 
Cancelled/Forfeited(288,728)$7.69 
Options Outstanding at September 30, 20224,684,956 $4.46 7.8
Options Exercisable at September 30, 20222,388,088 $6.33 7.0
Share-based Payment Arrangement, Restricted Stock Unit, Activity A summary of restricted stock units (RSUs) activity during the nine months ended September 30, 2022 is as follows:
 UnitsWeighted-Average
Grant-Data Fair Value
RSUs Outstanding at December 31, 20212,194,756 $16.36 
Granted2,321,885 $3.04 
Cancelled/Forfeited(699,279)$11.05 
Vested(567,453)$17.44 
RSUs Outstanding at September 30, 2022
3,249,909 $7.80 
Weighted-Average Assumptions Used to Determine the Fair Value of Options Granted
The weighted average assumptions used to determine the fair value of options granted in the nine months ended September 30, 2022 and 2021 were as follows:
 20222021
Volatility61.42 %58.70 %
Risk free interest rate3.19 %0.70 %
Expected life (years)4.554.28
Dividend yield0 %0 %