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Stockholders' Equity (Tables) | 6 Months Ended
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Jul. 02, 2021
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 |  |  | Six Months Ended |
|  | July 2, 2021 |  |  | July 3, 2020 |  |  | July 2, 2021 |  |  | July 3, 2020 |
Employee stock options |  | $ | 2,784 |  |  | $ | 2,505 |  |  | $ | 5,256 |  |  | $ | 4,737 |
Restricted stock |  |  | 232 |  |  |  | 76 |  |  |  | 398 |  |  |  | 154 |
Restricted stock units |  |  | 811 |  |  |  | 274 |  |  |  | 1,348 |  |  |  | 823 |
Performance stock units |  |  | 108 |  |  |  | — |  |  |  | 201 |  |  |  | — |
Nonemployee stock options |  |  | 57 |  |  |  | 63 |  |  |  | 119 |  |  |  | 125 |
Total stock-based compensation expense |  | $ | 3,992 |  |  | $ | 2,918 |  |  | $ | 7,322 |  |  | $ | 5,839 |
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 |  |  | Six Months Ended |
|  | July 2, 2021 |  |  | July 3, 2020 |  |  | July 2, 2021 |  |  | July 3, 2020 |
Cost of sales |  | $ | 54 |  |  | $ | 30 |  |  | $ | 89 |  |  | $ | 52 |
General and administrative |  |  | 1,815 |  |  |  | 1,209 |  |  |  | 3,254 |  |  |  | 2,294 |
Selling and marketing |  |  | 953 |  |  |  | 812 |  |  |  | 1,786 |  |  |  | 1,867 |
Research and development |  |  | 1,170 |  |  |  | 867 |  |  |  | 2,193 |  |  |  | 1,626 |
Total stock-based compensation expense, net |  |  | 3,992 |  |  |  | 2,918 |  |  |  | 7,322 |  |  |  | 5,839 |
Amounts capitalized as part of inventory |  |  | 390 |  |  |  | 291 |  |  |  | 699 |  |  |  | 560 |
Total stock-based compensation expense, gross |  | $ | 4,382 |  |  | $ | 3,209 |  |  | $ | 8,021 |  |  | $ | 6,399 |
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 |  |  | Six Months Ended |
|  | July 2, 2021 |  |  | July 3, 2020 |  |  | July 2, 2021 |  |  | July 3, 2020 |
Expected dividend yield |  |  | 0 | % |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Expected volatility |  |  | 53 | % |  |  | 53 | % |  |  | 53 | % |  |  | 53 | %
Risk-free interest rate |  |  | 0.83 | % |  |  | 0.31 | % |  |  | 0.84 | % |  |  | 0.53 | %
Expected term (in years) |  |  | 5.38 |  |  |  | 5.72 |  |  |  | 5.38 |  |  |  | 5.72 |
Schedule of Share-based Compensation, Stock Options, Activity | A summary of stock option activity under the Plan for six months ended July 2, 2021is presented below:
|  | Stock Options (in 000’s) |  |  | Minimum Exercise Price |  |  | Maximum Exercise Price |
Outstanding at January 1, 2021 |  |  | 3,418 |  |  |  |  |  |  |  |  |
Granted |  |  | 258 |  |  |  |  |  |  |  |  |
Exercised |  |  | (906 | ) |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (23 | ) |  |  |  |  |  |  |  |
Outstanding at July 2, 2021 |  |  | 2,747 |  |  | $ | 5.34 |  |  | $ | 154.96 |
Exercisable at July 2, 2021 |  |  | 1,928 |  |  |  |  |  |  |  |  |
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 six months ended July 2, 2021 is presented below (shares in thousands):
|  | Restricted Stock |  |  | RSUs |  |  | PSUs |
Unvested at January 1, 2021 |  |  | 11 |  |  |  | 122 |  |  |  | 15 |
Granted |  |  | 3 |  |  |  | 48 |  |  |  | — |
Vested |  |  | (11 | ) |  |  | (34 | ) |  |  | — |
Forfeited or expired |  |  | — |  |  |  | — |  |  |  | — |
Unvested at July 2, 2021 |  |  | 3 |  |  |  | 136 |  |  |  | 15 |

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