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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Summary of Stock Option Activity
A summary of the Company’s stock option activity is as follows (dollars in thousands except weighted average exercise price):
Number of
Options		Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual Life (Years)		Aggregate
Intrinsic
Value
Outstanding as of December 31, 2022
35,687,240 $3.37 7.3$22 
Granted4,000,000 1.08 
Exercised(49,456)0.89 $10 
Cancelled/forfeited(2,455,912)3.37 
Outstanding as of March 31, 2023
37,181,872 $3.15 7.5$31 
Summary of Weighted-Average Assumptions
The weighted-average assumptions used in the Black-Scholes option pricing model are as follows:
Three Months Ended
March 31,
20232022
Risk-free interest rate:3.5 %1.6 %
Expected term (in years):8.67.0
Expected volatility:90.2 %43.5 %
Dividend yield:0 %0 %
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity A summary of the Company’s RSU activity is as follows:
Shares Weighted Average Fair Value
Outstanding as of December 31, 202217,869,663 $1.09 
Granted 5,932,766 1.08
Released(1,145,334)1.24 
Forfeitures(2,525,984)1.11 
Outstanding as of March 31, 202320,131,111 $1.08 
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 (dollars in thousands):
Three Months Ended
March 31,
20232022
Research and development$11,294 $1,622 
Sales and marketing1,280 374 
General and administrative2,528 1,350 
$15,102 $3,346