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Stockholders' Equity (Tables) | 12 Months Ended
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Jan. 03, 2020
Schedule of Share-based Compensation, Fair Value of Stock-Based Compensation Granted | The following table represents the fair value of stock-based compensation granted during the year ended 2019 (in thousands):
|  | Fair Value |
Stock options |  | $ | 14,813 |
Restricted stock units |  |  | 728 |
Restricted stock |  |  | 313 |
Total stock-based compensation expense |  | $ | 15,854 |
Schedule of Compensation Cost | The cost that has been charged against income for stock-based compensation is set forth below (in thousands):
|  | Years Ended |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Employee stock option |  | $ | 8,144 |  |  | $ | 4,013 |  |  | $ | 1,731 |
Restricted stock |  |  | 320 |  |  |  | 274 |  |  |  | 186 |
Restricted stock units |  |  | 1,905 |  |  |  | 2,120 |  |  |  | 1,226 |
Nonemployee stock options |  |  | 178 |  |  |  | 355 |  |  |  | 18 |
Total stock-based compensation expense |  | $ | 10,547 |  |  | $ | 6,762 |  |  | $ | 3,161 |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs | The Company recorded stock-based compensation expense in the following categories (in thousands):
|  | Years Ended |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Cost of sales |  | $ | 52 |  |  | $ | 15 |  |  | $ | 8 |
General and administrative |  |  | 4,010 |  |  |  | 2,635 |  |  |  | 1,487 |
Marketing and selling |  |  | 3,318 |  |  |  | 1,805 |  |  |  | 805 |
Research and development |  |  | 3,167 |  |  |  | 2,307 |  |  |  | 861 |
Total stock-based compensation expense, net |  |  | 10,547 |  |  |  | 6,762 |  |  |  | 3,161 |
Amounts capitalized as part of inventory |  |  | 1,017 |  |  |  | 637 |  |  |  | 372 |
Total stock-based compensation expense, gross |  | $ | 11,564 |  |  | $ | 7,399 |  |  | $ | 3,533 |
Schedule of Unrecognized Compensation Cost, Non-Vested Stock-Based Compensation Arrangements | As of January 3, 2020, total unrecognized compensation cost related to non-vested stock-based compensation arrangements granted under the Plan were as follows (in thousands):
|  | 2019 |
Stock options |  | $ | 14,817 |
Restricted stock and restricted stock units |  |  | 594 |
Total unrecognized stock-based compensation cost |  | $ | 15,411 |
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.
|  | Years Ended |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Expected dividend yield |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Expected volatility |  |  | 53 | % |  |  | 53 | % |  |  | 57 | %
Risk-free interest rate |  |  | 2.40 | % |  |  | 2.71 | % |  |  | 1.96 | %
Expected term (in years) |  |  | 5.66 |  |  |  | 5.72 |  |  |  | 5.67 |
Schedule of Share-based Compensation, Stock Options, Activity | A summary of option activity under the Plan for the year ended January 3, 2020 is presented below:
|  | Shares (in 000’s) |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term (years) |  |  | Aggregate Intrinsic Value (in 000’s) |
Outstanding at December 28, 2018 |  |  | 3,920 |  |  | $ | 11.80 |  |  |  |  |  |  |  |  |
Granted |  |  | 824 |  |  |  | 35.40 |  |  |  |  |  |  |  |  |
Exercised |  |  | (388 | ) |  |  | 8.92 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (30 | ) |  |  | 25.87 |  |  |  |  |  |  |  |  |
Outstanding at January 3, 2020 |  |  | 4,326 |  |  | $ | 16.46 |  |  |  | 6.51 |  |  | $ | 78,995 |
Exercisable at January 3, 2020 |  |  | 3,047 |  |  | $ | 10.66 |  |  |  | 5.54 |  |  | $ | 72,393 |
Share-based Compensation, Performance Shares Award Unvested Activity | A summary of unvested options activity under the Plan for the year ended January 3, 2020 was as follows:
|  | Shares (in 000’s) |  |  | Weighted- Average Grant-Date Fair Value |
Unvested at December 28, 2018 |  |  | 1,260 |  |  | $ | 9.67 |
Granted |  |  | 824 |  |  |  | 17.95 |
Forfeited or expired |  |  | (30 | ) |  |  | 13.29 |
Vested |  |  | (775 | ) |  |  | 8.83 |
Unvested at January 3, 2020 |  |  | 1,279 |  |  | $ | 15.44 |
Summary of Weighted Average Grant Date Fair Value of Options Granted and Total intrinsic Value of options Exercised | The weighted average grant date fair value of options granted and the total intrinsic value of options exercised were as follows:
|  | Years Ended |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Weighted-average grant-date fair value |  | $ | 17.95 |  |  | $ | 11.95 |  |  | $ | 5.42 |
Intrinsic value of options (in thousands) |  | $ | 9,955 |  |  | $ | 13,699 |  |  | $ | 3,065 |
Restricted Stock |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity | A summary of restricted stock activity under the Plan for the year ended January 3, 2020 was as follows:
|  | Shares (in 000’s) |  |  | Weighted- Average Grant- Date Fair Value |
Outstanding at December 28, 2018 |  |  | 11 |  |  | $ | 29.80 |
Granted |  |  | 11 |  |  |  | 29.39 |
Vested |  |  | (11 | ) |  |  | 29.80 |
Outstanding at January 3, 2020 |  |  | 11 |  |  | $ | 29.39 |
Restricted Stock Units (RSUs) |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity | A summary of restricted stock units’ activity under the Plan for the year ended January 3, 2020 was as follows:
|  | Units (in 000’s) |  |  | Weighted- Average Grant- Date Fair Value |
Outstanding at December 28, 2018 |  |  | 322 |  |  | $ | 10.46 |
Granted |  |  | 19 |  |  |  | 37.98 |
Vested |  |  | (229 | ) |  |  | 12.58 |
Forfeited or expired |  |  | (8 | ) |  |  | 11.57 |
Outstanding at January 3, 2020 |  |  | 104 |  |  | $ | 10.79 |

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