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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2022
Stockholders Equity Note [Abstract] |
Schedule of Compensation Cost | The cost that has been charged against income for stock-based compensation is set forth below (in thousands):
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, 2022 |  |  | October 1, 2021 |  |  | September 30, 2022 |  |  | October 1, 2021 |
Employee stock options |  | $ | 2,865 |  |  | $ | 2,594 |  |  | $ | 7,649 |  |  | $ | 7,850 |
Restricted stock |  |  | 67 |  |  |  | 109 |  |  |  | 618 |  |  |  | 507 |
Restricted stock units |  |  | 1,249 |  |  |  | 700 |  |  |  | 3,242 |  |  |  | 2,048 |
Performance stock units |  |  | 1,240 |  |  |  | 124 |  |  |  | 2,932 |  |  |  | 325 |
Nonemployee stock options |  |  | 306 |  |  |  | 136 |  |  |  | 934 |  |  |  | 255 |
Total stock-based compensation expense |  | $ | 5,727 |  |  | $ | 3,663 |  |  | $ | 15,375 |  |  | $ | 10,985 |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs | The Company recorded stock-based compensation costs in the following categories (in thousands):
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, 2022 |  |  | October 1, 2021 |  |  | September 30, 2022 |  |  | October 1, 2021 |
Cost of sales |  | $ | 233 |  |  | $ | 61 |  |  | $ | 409 |  |  | $ | 150 |
General and administrative |  |  | 2,584 |  |  |  | 1,671 |  |  |  | 7,171 |  |  |  | 4,925 |
Selling and marketing |  |  | 1,335 |  |  |  | 851 |  |  |  | 3,548 |  |  |  | 2,637 |
Research and development |  |  | 1,575 |  |  |  | 1,080 |  |  |  | 4,247 |  |  |  | 3,273 |
Total stock-based compensation expense, net |  |  | 5,727 |  |  |  | 3,663 |  |  |  | 15,375 |  |  |  | 10,985 |
Amounts capitalized as part of inventory |  |  | 361 |  |  |  | 383 |  |  |  | 1,379 |  |  |  | 1,082 |
Total stock-based compensation expense, gross |  | $ | 6,088 |  |  | $ | 4,046 |  |  | $ | 16,754 |  |  | $ | 12,067 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The risk-free rate is based on the U.S. Treasury yield curve corresponding to the expected term at the time of the grant.
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, 2022 |  |  | October 1, 2021 |  |  | September 30, 2022 |  |  | October 1, 2021 |
Expected dividend yield |  |  | 0 | % |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Expected volatility |  |  | 54 | % |  |  | 53 | % |  |  | 54 | % |  |  | 53 | %
Risk-free interest rate |  |  | 2.91 | % |  |  | 0.79 | % |  |  | 1.88 | % |  |  | 0.84 | %
Expected term (in years) |  |  | 5.10 |  |  |  | 5.38 |  |  |  | 5.10 |  |  |  | 5.38 |
Schedule of Share-based Compensation, Stock Options, Activity | A summary of stock option activity under the Plan for nine months ended September 30, 2022 is presented below:
|  | Stock Options (in 000’s) |  |  | Minimum Exercise Price |  |  | Maximum Exercise Price |
Outstanding at December 31, 2021 |  |  | 2,435 |  |  |  |  |  |  |  |  |
Granted |  |  | 443 |  |  |  |  |  |  |  |  |
Exercised |  |  | (417 | ) |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (23 | ) |  |  |  |  |  |  |  |
Outstanding at September 30, 2022 |  |  | 2,438 |  |  | $ | 5.34 |  |  | $ | 154.96 |
Exercisable at September 30, 2022 |  |  | 1,778 |  |  |  |  |  |  |  |  |
Schedule of Share-based Compensation, Restricted Stock, RSUs and PSUs Activity | A summary of restricted stock, RSUs and PSUs activity under the Plan for the nine months ended September 30, 2022 is presented below (shares in thousands):
|  | Restricted Stock |  |  | RSUs |  |  | PSUs |
Unvested at December 31, 2021 |  |  | 3 |  |  |  | 131 |  |  |  | 10 |
Granted |  |  | 6 |  |  |  | 116 |  |  |  | 113 |
Vested |  |  | (5 | ) |  |  | (57 | ) |  |  | (5 | )
Unvested at September 30, 2022 |  |  | 4 |  |  |  | 190 |  |  |  | 118 |

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