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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2021
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 (options in thousands):
Year Ended
December 31, 2021
OptionsPrice
Outstanding, beginning of period6,507 $3.94 
Granted1,551 8.82 
Exercised(1,511)2.77 
Forfeited(182)6.00 
Outstanding, end of period6,365 5.34 
Vested and expected to vest6,365 5.34 
Exercisable3,082 4.15 
Schedule of Restricted Stock Unit Activity
A summary of the Company’s restricted stock unit activity and related information are as follows (restricted stock units in thousands):
Year Ended
December 31, 2021
Restricted Stock Units
Weighted-Average
Fair Value
Outstanding, beginning of period— $— 
Awarded
35 34.78 
Outstanding, end of period35 34.78 
Share-based Payment Arrangement, Expensed and Capitalized, Amount
Total stock-based compensation recognized, before taxes, are as follows (in thousands):
Year Ended December 31,
20212020
Cost of sales$253 $80 
Research and development783 543 
Sales, general and administrative2,760 1,550 
Total stock-based compensation$3,796 $2,173 
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,
20212020
Expected life (years)6.06.0
Expected volatility 50 %41 %
Risk-free interest rate 1.0 %0.9 %
Expected dividend rate — %— %
Weighted-average fair value$4.36 $1.95 
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, 2021
Expected life (years)0.9
Expected volatility 50 %
Risk-free interest rate 0.1 %
Expected dividend rate — %
Weighted-average fair value$8.44