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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock Option Activity and Related Information
A summary of the Company’s stock option activity and related information are as follows (shares in thousands):
Nine Months Ended
September 30, 2023
Number of SharesWeighted-Average Exercise Price
Outstanding, beginning of period5,353 $6.93 
Granted398 36.83 
Exercised(323)4.67 
Forfeited(14)11.01 
Outstanding, end of period5,414 9.26 
Vested and expected to vest5,414 9.26 
Exercisable3,961 6.50 
Schedule of Fair Value Assumptions
The fair value of the options granted to employees or directors was estimated as of the grant date using the Black-Scholes model assuming the weighted-average assumptions listed in the following table:
Three Months Ended September 30,Nine Months Ended September 30,
2023202220232022
Expected life (years)0.00.06.05.9
Expected volatility — %— %57 %55 %
Risk-free interest rate — %— %4.0 %2.5 %
Expected dividend rate — %— %— %— %
Weighted-average fair value$— $— $21.02 $19.15 
The fair value of the awards granted under the ESPP for the nine months ended September 30, 2023 to employees was estimated as of the grant date using the Black-Scholes model assuming the weighted-average assumptions listed in the following table:
Nine Months Ended September 30,
2023
Expected life (years)0.8
Expected volatility 55 %
Risk-free interest rate 5.0 %
Expected dividend rate — %
Weighted-average fair value$11.28 
Schedule of Restricted Stock Unit Activity A summary of the Company’s restricted stock unit or RSU activity and related information are as follows (shares in thousands):
Nine Months Ended
September 30, 2023
Number of SharesWeighted Average Grant Date Fair Value
Outstanding, beginning of period742 $36.35 
Awarded1,031 36.54 
Forfeited(86)35.00 
Vested(169)35.87 
Outstanding, end of period1,518 36.61 
Schedule of Share-based Payment Arrangement, Expensed and Capitalized, Amount
Total stock-based compensation recognized, before taxes, are as follows (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2023202220232022
Cost of sales$660 337 $1,730 712 
Research and development1,375 678 3,506 1,531 
Sales, general and administrative3,922 2,210 10,509 5,209 
Stock-based compensation capitalized in inventory(631)— (1,592)— 
Total stock-based compensation$5,326 $3,225 $14,153 $7,452