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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Share-based Payment Arrangement, Expensed and Capitalized, Amount
Total stock-based compensation recognized, before taxes, are as follows (in thousands):
Year Ended December 31,
202320222021
Cost of sales$2,493 $1,053 $253 
Research and development4,798 2,230 783 
Sales, general and administrative14,401 7,387 2,760 
Stock-based compensation capitalized in inventory
$(2,558)$(333)— 
Total stock-based compensation$19,134 $10,337 $3,796 
Schedule of Stock Option Activity and Related Information
A summary of the Company’s stock option activity and related information are as follows (options in thousands):
Year Ended
December 31, 2023
Options
Weighted Average Exercise Price
Outstanding, beginning of period5,353 $6.93 
Granted398 36.83 
Exercised(520)4.77 
Forfeited(16)11.62 
Outstanding, end of period5,215 9.42 
Vested and expected to vest5,215 9.42 
Exercisable4,042 6.80 
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:
Year Ended December 31,
202320222021
Expected life (years)6.05.96.0
Expected volatility 57 %55 %50 %
Risk-free interest rate 4.0 %2.5 %1.0 %
Expected dividend rate — %— %— %
Weighted-average fair value$21.02 $19.15 $4.36 
The fair value of the options granted under the 2021 ESPP to employees was estimated as of the grant date using the Black-Scholes model assuming the weighted-average assumptions listed in the following table:
Year Ended December 31,
20232022
Expected life (years)0.70.7
Expected volatility 53 %56 %
Risk-free interest rate 5.1 %4.2 %
Expected dividend rate — %— %
Weighted-average fair value$11.20 $15.11 
Schedule of Restricted Stock Unit Activity
A summary of the Company’s restricted stock unit or RSU activity and related information are as follows (RSUs in thousands):
Year Ended
December 31, 2023
Restricted Stock Units
Weighted-Average
Fair Value
Outstanding, beginning of period742 $36.35 
Granted
1,144 36.16 
Canceled/forfeited
(119)35.31 
Released
(202)36.50 
Outstanding, end of period1,565 36.27