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Stockholders' Equity | 3 Months Ended
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Mar. 29, 2019
Stockholders Equity Note [Abstract] |
Stockholders' Equity | Note 11 — Stockholders’ Equity Stock-Based Compensation 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 |
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 |
Note 11 — Stockholders’ Equity (Continued) Incentive Plan The Amended and Restated Omnibus Equity Incentive Plan (“the Plan”) provides for various forms of stock-based incentives. To date, of the available forms of awards under the Plan, the Company has granted only stock options, restricted stock, unrestricted share grants, and restricted stock units (“RSUs”). Options under the Plan are granted at fair market value on the date of grant, become exercisable generally over a three-year period, or as determined by the Board of Directors, and expire over periods not exceeding 10 years from the date of grant. Certain option and share awards provide for accelerated vesting if there is a change in control and pre-established financial metrics are met (as defined in the Plan). Grants of restricted stock outstanding under the Plan generally vest over periods of one to three years. Grants of RSUs outstanding under the Plan generally vest based on service, performance, or a combination of both. As of March 29, 2019, there were 1,694,616 shares available for grant under the Plan Assumptions The fair value of each option award is estimated on the date of grant using a Black-Scholes option valuation model applying the weighted-average assumptions noted in the following table. Expected volatilities are based on historical volatility of the Company’s stock. The expected term of options granted is derived from the historical exercises and post-vesting cancellations and represents the period of time that options granted are expected to be outstanding. The Company has calculated an 8% estimated forfeiture rate based on historical forfeiture experience. 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 |
Stock Options 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 |  |  |  |  |  |  |  |  |
Note 11 — Stockholders’ Equity (Continued) Restricted Stock and Restricted Stock Units 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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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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