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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2022
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):
Six Months Ended
June 30, 2022
Number of SharesWeighted Average Exercise Price
Outstanding, beginning of period6,365 $5.34 
Granted254 35.58 
Exercised(802)3.57 
Forfeited(151)7.09 
Outstanding, end of period5,666 6.90 
Vested and expected to vest5,666 6.90 
Exercisable2,933 4.63 
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 June 30,Six Months Ended June 30,
2022202120222021
Expected life (years)5.86.05.96.0
Expected volatility 56 %52 %55 %49 %
Risk-free interest rate 2.9 %1.1 %2.5 %1.1 %
Expected dividend rate — %— %— %— %
Weighted-average fair value$20.07 $3.59 $19.15 $3.14 
The fair value of the awards granted under the ESPP for the six months ended June 30, 2022 to employees was estimated as of the grant date using the Black-Scholes model assuming the weighted-average assumptions listed in the following table:
Six Months Ended June 30,
2022
Expected life (years)0.8
Expected volatility 57 %
Risk-free interest rate 1.8 %
Expected dividend rate — %
Weighted-average fair value$12.25 
Share-based Payment Arrangement, Outstanding Award, Activity, Excluding Option A summary of the Company’s restricted stock unit (“RSU”) activity and related information are as follows (restricted stock units in thousands):
Six Months Ended
June 30, 2022
Number of SharesWeighted Average Grant Date Fair Value
Outstanding, beginning of period35 $34.78 
Awarded538 34.14 
Forfeited(14)31.76 
Outstanding, end of period559 34.22 
Share-based Payment Arrangement, Expensed and Capitalized, Amount
Total stock-based compensation recognized, before taxes, are as follows (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2022202120222021
Cost of sales$252 $51 $375 $74 
Research and development553 155 853 307 
Sales, general and administrative1,871 519 3,000 994 
Total stock-based compensation$2,676 $725 $4,228 $1,375