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Stockholders' Equity (Tables) | 9 Months Ended
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Oct. 02, 2020
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 |
|  | October 2, 2020 |  |  | September 27, 2019 |  |  | October 2, 2020 |  |  | September 27, 2019 |
Employee stock options |  | $ | 2,469 |  |  | $ | 2,178 |  |  | $ | 7,206 |  |  | $ | 5,770 |
Restricted stock |  |  | 119 |  |  |  | 77 |  |  |  | 273 |  |  |  | 236 |
Restricted stock units |  |  | 415 |  |  |  | 246 |  |  |  | 1,238 |  |  |  | 1,661 |
Performance stock units |  |  | 54 |  |  |  | — |  |  |  | 54 |  |  |  | — |
Nonemployee stock options |  |  | 69 |  |  |  | 57 |  |  |  | 194 |  |  |  | 111 |
Total stock-based compensation expense |  | $ | 3,126 |  |  | $ | 2,558 |  |  | $ | 8,965 |  |  | $ | 7,778 |
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 |
|  | October 2, 2020 |  |  | September 27, 2019 |  |  | October 2, 2020 |  |  | September 27, 2019 |
Cost of sales |  | $ | 30 |  |  | $ | 7 |  |  | $ | 82 |  |  | $ | 43 |
General and administrative |  |  | 1,307 |  |  |  | 1,082 |  |  |  | 3,601 |  |  |  | 2,878 |
Marketing and selling |  |  | 807 |  |  |  | 692 |  |  |  | 2,674 |  |  |  | 2,553 |
Research and development |  |  | 982 |  |  |  | 777 |  |  |  | 2,608 |  |  |  | 2,304 |
Total stock-based compensation expense, net |  |  | 3,126 |  |  |  | 2,558 |  |  |  | 8,965 |  |  |  | 7,778 |
Amounts capitalized as part of inventory |  |  | 287 |  |  |  | 258 |  |  |  | 847 |  |  |  | 723 |
Total stock-based compensation expense, gross |  | $ | 3,413 |  |  | $ | 2,816 |  |  | $ | 9,812 |  |  | $ | 8,501 |
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 |
|  | October 2, 2020 |  |  | September 27, 2019 |  |  | October 2, 2020 |  |  | September 27, 2019 |
Expected dividend yield |  |  | 0 | % |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Expected volatility |  |  | 53 | % |  |  | 53 | % |  |  | 53 | % |  |  | 53 | %
Risk-free interest rate |  |  | 0.31 | % |  |  | 1.55 | % |  |  | 0.53 | % |  |  | 2.40 | %
Expected term (in years) |  |  | 5.72 |  |  |  | 5.67 |  |  |  | 5.72 |  |  |  | 5.67 |
Schedule of Share-based Compensation, Stock Options, Activity | A summary of stock option activity under the Plan for the nine months ended October 2, 2020 is presented below:
|  | Stock Options (in 000’s) |  |  | Minimum Exercise Price |  |  | Maximum Exercise Price |
Outstanding at January 3, 2020 |  |  | 4,326 |  |  |  |  |  |  |  |  |
Granted |  |  | 616 |  |  |  |  |  |  |  |  |
Exercised |  |  | (1,146 | ) |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (14 | ) |  |  |  |  |  |  |  |
Outstanding at October 2, 2020 |  |  | 3,782 |  |  | $ | 5.05 |  |  | $ | 51.42 |
Exercisable at October 2, 2020 |  |  | 2,594 |  |  |  |  |  |  |  |  |
Schedule of Share-based Compensation, Restricted Stock, Restricted Stock Units and Performance Stock Units Activity | A summary of restricted stock, RSUs and PSUs activity under the Plan for the nine months ended October 2, 2020 is presented below:
|  | Restricted Stock (in 000’s) |  |  | Restricted Stock Units (in 000’s) |  |  | Performance Stock Units (in 000’s) |
Unvested at January 3, 2020 |  |  | 11 |  |  |  | 104 |  |  |  | — |
Granted |  |  | 11 |  |  |  | 127 |  |  |  | 15 |
Vested |  |  | (11 | ) |  |  | (93 | ) |  |  | — |
Forfeited or expired |  |  | — |  |  |  | (1 | ) |  |  | — |
Unvested at October 2, 2020 |  |  | 11 |  |  |  | 137 |  |  |  | 15 |

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