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Stock-Based Incentive Compensation Plans (Tables)
6 Months Ended
Jun. 30, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of Available for Grant A summary of shares available for grant under the Company’s 2021 Equity Incentive Plan, or the 2021 Plan, is as follows:
Shares Available for Grant
Shares available for grant as of January 1, 20231,443,946 
Authorized1,252,287 
Granted/Awarded(2,238,980)
Cancelled338,871 
Withheld for taxes45,468 
Shares available for grant as of June 30, 2023
841,592 
Schedule of Stock Option Activity
A summary of stock option activity for the six months ended June 30, 2023 is set forth below:
Options Outstanding
Number of SharesWeighted-Average Exercise PriceWeighted Average Remaining Contractual Term (in Years)
Balances as of January 1, 20233,446,583 $3.61 8.06
Granted314,801 $3.21 
Exercised(181,742)$0.03 
Cancelled(122,141)$4.07 
Balances at June 30, 2023
3,457,501 $3.75 5.21
Vested and exercisable at June 30, 2023
2,057,141 $3.03 4.81
Vested and expected to vest at June 30, 2023
3,457,501 $3.75 5.21
Schedule of Restricted Stock Units
Activity with respect to restricted stock units was as follows:
Number of Shares Underlying Outstanding Restricted Stock UnitsWeighted Average Grant Date Fair Value
Unvested, January 1, 20231,756,209 $10.15 
Granted1,924,179 $4.60 
Vested(471,534)$9.70 
Cancelled(216,730)$8.72 
Unvested, June 30, 2023
2,992,124 $6.76 
Schedule of Share-based Payment Arrangement, Expensed and Capitalized, Amount
The Company recognized stock-based compensation as follows (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2023202220232022
Cost of goods sold$148 $163 $294 $273 
Research and development733 748 1,233 1,188 
Selling, general and administrative1,774 1,692 3,253 2,630 
Total stock-based compensation$2,655 $2,603 $4,780 $4,091 
The above stock-based compensation expense related to the following equity-based awards (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2023202220232022
Stock options and restricted stock units$2,606 $2,491 $4,677 $3,843 
ESPP49 112 103 248 
Total stock-based compensation$2,655 $2,603 $4,780 $4,091