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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 28, 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 |  |  | Six Months Ended |
|  | June 28, 2019 |  |  | June 29, 2018 |  |  | June 28, 2019 |  |  | June 29, 2018 |
Employee stock options |  | $ | 2,162 |  |  | $ | 897 |  |  | $ | 3,592 |  |  | $ | 1,516 |
Restricted stock |  |  | 77 |  |  |  | 59 |  |  |  | 159 |  |  |  | 110 |
Restricted stock units |  |  | 311 |  |  |  | 494 |  |  |  | 1,415 |  |  |  | 1,092 |
Nonemployee stock options |  |  | 29 |  |  |  | 148 |  |  |  | 54 |  |  |  | 181 |
Total stock-based compensation expense |  | $ | 2,579 |  |  | $ | 1,598 |  |  | $ | 5,220 |  |  | $ | 2,899 |
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 |
|  | June 28, 2019 |  |  | June 29, 2018 |  |  | June 28, 2019 |  |  | June 29, 2018 |
Cost of sales |  | $ | 22 |  |  | $ | 4 |  |  | $ | 36 |  |  | $ | 7 |
General and administrative |  |  | 1,018 |  |  |  | 655 |  |  |  | 1,796 |  |  |  | 1,174 |
Marketing and selling |  |  | 690 |  |  |  | 366 |  |  |  | 1,861 |  |  |  | 826 |
Research and development |  |  | 849 |  |  |  | 573 |  |  |  | 1,527 |  |  |  | 892 |
Total stock-based compensation expense, net |  |  | 2,579 |  |  |  | 1,598 |  |  |  | 5,220 |  |  |  | 2,899 |
Amounts capitalized as part of inventory |  |  | 276 |  |  |  | 145 |  |  |  | 465 |  |  |  | 267 |
Total stock-based compensation expense, gross |  | $ | 2,855 |  |  | $ | 1,743 |  |  | $ | 5,685 |  |  | $ | 3,166 |
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 |
|  | June 28, 2019 |  |  | June 29, 2018 |  |  | June 28, 2019 |  |  | June 29, 2018 |
Expected dividend yield |  |  | 0 | % |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Expected volatility |  |  | 53 | % |  |  | 53 | % |  |  | 53 | % |  |  | 53 | %
Risk-free interest rate |  |  | 2.05 | % |  |  | 2.81 | % |  |  | 2.41 | % |  |  | 2.70 | %
Expected term (in years) |  |  | 5.67 |  |  |  | 5.72 |  |  |  | 5.67 |  |  |  | 5.72 |
Schedule of Share-based Compensation, Stock Options, Activity | A summary of stock option activity under the Plan for the six months ended June 28, 2019 is presented below:
|  | Stock Options (in 000’s) |  |  | Minimum Exercise Price |  |  | Maximum Exercise Price |
Outstanding at December 28, 2018 |  |  | 3,920 |  |  |  |  |  |  |  |  |
Granted |  |  | 801 |  |  |  |  |  |  |  |  |
Exercised |  |  | (126 | ) |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (16 | ) |  |  |  |  |  |  |  |
Outstanding at June 28, 2019 |  |  | 4,579 |  |  | $ | 3.50 |  |  | $ | 43.84 |
Exercisable at June 28, 2019 |  |  | 3,026 |  |  |  |  |  |  |  |  |
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 six months ended June 28, 2019 is presented below:
|  | Restricted Stock (in 000’s) |  |  | Restricted Stock Units (in 000’s) |
Unvested at December 28, 2018 |  |  | 11 |  |  |  | 322 |
Granted |  |  | 11 |  |  |  | 19 |
Vested |  |  | (11 | ) |  |  | (202 | )
Forfeited or expired |  |  | — |  |  |  | (5 | )
Unvested at June 28, 2019 |  |  | 11 |  |  |  | 134 |

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