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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 29, 2019
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 |
|  | March 29, 2019 |  |  | March 30, 2018 |
Employee stock option |  | $ | 1,430 |  |  | $ | 619 |
Restricted stock |  |  | 82 |  |  |  | 51 |
Restricted stock units |  |  | 1,104 |  |  |  | 598 |
Nonemployee stock options |  |  | 25 |  |  |  | 33 |
Total stock-based compensation expense |  | $ | 2,641 |  |  | $ | 1,301 |
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 |
|  | March 29, 2019 |  |  | March 30, 2018 |
Cost of sales |  | $ | 14 |  |  | $ | 3 |
General and administrative |  |  | 778 |  |  |  | 519 |
Marketing and selling |  |  | 1,171 |  |  |  | 460 |
Research and development |  |  | 678 |  |  |  | 319 |
Total stock-based compensation expense, net |  |  | 2,641 |  |  |  | 1,301 |
Amounts capitalized as part of inventory |  |  | 189 |  |  |  | 122 |
Total stock-based compensation expense, gross |  | $ | 2,830 |  |  | $ | 1,423 |
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 |
|  | March 29, 2019 |  |  | March 30, 2018 |
Expected dividend yield |  |  | 0 | % |  |  | 0 | %
Expected volatility |  |  | 53 | % |  |  | 53 | %
Risk-free interest rate |  |  | 2.43 | % |  |  | 2.61 | %
Expected term (in years) |  |  | 5.67 |  |  |  | 5.72 |
Schedule of Share-based Compensation, Stock Options, Activity | A summary of stock option activity under the Plan for the three months ended March 29, 2019 is presented below:
|  | Stock Options (in 000’s) |  |  | Minimum Exercise Price |  |  | Maximum Exercise Price |
Outstanding at December 28, 2018 |  |  | 3,920 |  |  |  |  |  |  |  |  |
Granted |  |  | 749 |  |  |  |  |  |  |  |  |
Exercised |  |  | (74 | ) |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (1 | ) |  |  |  |  |  |  |  |
Outstanding at March 29, 2019 |  |  | 4,594 |  |  | $ | 1.92 |  |  | $ | 43.84 |
Exercisable at March 29, 2019 |  |  | 2,839 |  |  |  |  |  |  |  |  |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity | A summary of restricted stock and RSU activity under the Plan for the three months ended March 29, 2019 is presented below:
|  | Restricted Stock (in 000’s) |  |  | Restricted Stock Units (in 000’s) |
Unvested at December 28, 2018 |  |  | 11 |  |  |  | 322 |
Granted |  |  | — |  |  |  | 19 |
Vested |  |  | — |  |  |  | (178 | )
Forfeited or expired |  |  | — |  |  |  | (1 | )
Unvested at March 29, 2019 |  |  | 11 |  |  |  | 162 |

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