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Stockholders' Equity (Tables) | 12 Months Ended
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Jan. 01, 2021
Stockholders Equity Note [Abstract] |
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 2020 (in thousands):
|  | Fair Value |
Stock options |  | $ | 8,592 |
Restricted stock units |  |  | 4,260 |
Performance stock units |  |  | 790 |
Restricted stock |  |  | 644 |
Total stock-based compensation expense |  | $ | 14,286 |
Schedule of Compensation Cost | The Company recorded stock-based compensation expense by award as follows (in thousands):
|  | Years Ended |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Employee stock option |  | $ | 9,577 |  |  | $ | 8,144 |  |  | $ | 4,013 |
Restricted stock |  |  | 428 |  |  |  | 320 |  |  |  | 274 |
Restricted stock units |  |  | 1,732 |  |  |  | 1,905 |  |  |  | 2,120 |
Performance stock units |  |  | 147 |  |  |  | — |  |  |  | — |
Nonemployee stock options |  |  | 262 |  |  |  | 178 |  |  |  | 355 |
Total stock-based compensation expense |  | $ | 12,146 |  |  | $ | 10,547 |  |  | $ | 6,762 |
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 |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Cost of sales |  | $ | 112 |  |  | $ | 52 |  |  | $ | 15 |
General and administrative |  |  | 4,925 |  |  |  | 4,010 |  |  |  | 2,635 |
Selling and marketing |  |  | 3,471 |  |  |  | 3,318 |  |  |  | 1,805 |
Research and development |  |  | 3,638 |  |  |  | 3,167 |  |  |  | 2,307 |
Total stock-based compensation expense, net |  |  | 12,146 |  |  |  | 10,547 |  |  |  | 6,762 |
Amounts capitalized as part of inventory |  |  | 1,129 |  |  |  | 1,017 |  |  |  | 637 |
Total stock-based compensation expense, gross |  | $ | 13,275 |  |  | $ | 11,564 |  |  | $ | 7,399 |
Schedule of Unrecognized Compensation Cost, Non-Vested Stock-Based Compensation Arrangements | As of January 1, 2021, total unrecognized compensation cost related to non-vested stock-based compensation arrangements granted under the Plan were as follows (in thousands):
|  | 2020 |
Stock options |  | $ | 12,545 |
Restricted stock, restricted stock units and performance stock units |  |  | 3,917 |
Total unrecognized stock-based compensation cost |  | $ | 16,462 |
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 |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Expected dividend yield |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Expected volatility |  |  | 53 | % |  |  | 53 | % |  |  | 53 | %
Risk-free interest rate |  |  | 0.53 | % |  |  | 2.40 | % |  |  | 2.71 | %
Expected term (in years) |  |  | 5.72 |  |  |  | 5.66 |  |  |  | 5.72 |
Schedule of Share-based Compensation, Stock Options, Activity | A summary of option activity under the Plan for the year ended January 1, 2021 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 January 3, 2020 |  |  | 4,326 |  |  | $ | 16.46 |  |  |  |  |  |  |  |  |
Granted |  |  | 621 |  |  |  | 28.78 |  |  |  |  |  |  |  |  |
Exercised |  |  | (1,507 | ) |  |  | 13.70 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (22 | ) |  |  | 32.35 |  |  |  |  |  |  |  |  |
Outstanding at January 1, 2021 |  |  | 3,418 |  |  | $ | 19.80 |  |  |  | 6.60 |  |  | $ | 203,087 |
Exercisable at January 1, 2021 |  |  | 2,372 |  |  | $ | 15.05 |  |  |  | 5.66 |  |  | $ | 152,218 |
Share-based Compensation, Performance Shares Award Unvested Activity | A summary of unvested options activity under the Plan for the year ended January 1, 2021 was as follows:
|  | Shares (in 000’s) |  |  | Weighted-Average Grant-Date Fair Value |
Unvested at January 3, 2020 |  |  | 1,279 |  |  | $ | 15.44 |
Granted |  |  | 621 |  |  |  | 13.85 |
Forfeited or expired |  |  | (22 | ) |  |  | 16.52 |
Vested |  |  | (832 | ) |  |  | 14.66 |
Unvested at January 1, 2021 |  |  | 1,046 |  |  | $ | 15.09 |
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 |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Weighted-average grant-date fair value |  | $ | 13.85 |  |  | $ | 17.95 |  |  | $ | 11.95 |
Intrinsic value of options (in thousands) |  | $ | 59,771 |  |  | $ | 9,955 |  |  | $ | 13,699 |
Schedule of Share-based Compensation, Restricted Stock, Restricted Stock Units and Performance Stock Units Activity | A summary of restricted stock, RSU and PSU activity under the Plan for the year ended January 1, 2021was as follows:
|  | Restricted Stock |  |  | Restricted Stock Units |  |  | Performance Stock Units |
|  | Units (in 000’s) |  |  | Weighted- Average Grant- Date Fair Value |  |  | Units (in 000’s) |  |  | Weighted- Average Grant- Date Fair Value |  |  | Units (in 000’s) |  |  | Weighted- Average Grant- Date Fair Value |
Outstanding at January 3, 2020 |  |  | 11 |  |  | $ | 29.39 |  |  |  | 104 |  |  | $ | 10.79 |  |  |  | — |  |  | $ | — |
Granted |  |  | 11 |  |  |  | 58.25 |  |  |  | 127 |  |  |  | 33.57 |  |  |  | 15 |  |  |  | 51.42 |
Vested |  |  | (11 | ) |  |  | 29.82 |  |  |  | (108 | ) |  |  | 12.52 |  |  |  | — |  |  |  | — |
Forfeited or expired |  |  | — |  |  |  | — |  |  |  | (1 | ) |  |  | 13.80 |  |  |  | — |  |  |  | — |
Outstanding at January 1, 2021 |  |  | 11 |  |  | $ | 59.06 |  |  |  | 122 |  |  | $ | 32.97 |  |  |  | 15 |  |  | $ | 51.42 |

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