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Stock Plans (Tables)
12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Share-based Compensation Arrangements by Share-based Payment Award
A summary of shares available for grant under the 2021 Plan is as follows:
Shares Available for Grant
Shares available for grant as of January 1, 2020
— 
Shares authorized3,591,888 
Granted
(2,951,534)
Canceled
178,535 
Shares available for grant as of December 31, 2020
818,889 
Authorized2,900,000 
Retired(485,581)
Granted/Awarded
(1,218,021)
Canceled
117,463 
Shares available for grant as of December 31, 2021
2,132,750 
Summary of Stock Option Activity
A summary of stock option activity for the years ended December 31, 2021 and 2020 is set forth below:
Options Outstanding
Number of SharesWeighted-Average Exercise PriceWeighted Average Remaining Contractual Term (in Years)
Balances as of January 1, 2020178,787 $47.97 7.89
Granted2,951,534 $0.03 
Exercised(112,049)$0.10 
Cancelled(183,007)$46.82 
Balances as of December 31, 2020
2,835,265 $0.03 9.57
Granted588,980 $13.40 
Exercised(300,768)$0.03 
Cancelled(84,507)$0.48 
Balances at December 31, 2021
3,038,970 $2.61 8.83
Vested and exercisable at December 31, 2021
1,034,861 $0.64 8.62
Vested and expected to vest at December 31, 2021
3,038,970 $2.61 8.83
Schedule of Nonvested Restricted Stock Units Activity
Activity with respect to restricted stock units, or RSUs, was as follows:
Number of Shares Underlying Outstanding Restricted Stock UnitsWeighted Average Grant Date Fair Value
Unvested, January 1, 2021— $— 
Granted629,041 $22.14 
Cancelled(32,956)$23.58 
Unvested, December 31, 2021596,085 $22.06 
Share-based Payment Arrangement, Expensed and Capitalized, Amount
The Company recognized stock-based compensation as follows (in thousands):
Year Ended December 31,
2021
2020
Cost of goods sold$270 $21 
Research and development1,227 454 
Selling, general and administrative2,791 904 
Total stock-based compensation$4,288 $1,379 
The above stock-based compensation expense related to the following equity-based awards (in thousands):
Year Ended December 31,
2021
2020
Stock options and restricted stock units$3,128 $1,379 
ESPP1,160 — 
Total stock-based compensation$4,288 $1,379 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions The fair value of employee stock options was estimated using the following assumptions for the years ended December 31, 2021 and December 31, 2020:
Year Ended December 31,
2021
2020
Expected term (in years)
6.00 - 6.25
6.25
Expected volatility
50% - 53%
51%
Weighted average risk-free interest rate
0.59% - 1.33%
0.53%
Fair value of common stock
$0.40 - $21.67
$0.03 - $0.52
Dividend yield—%—%