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Stock-Based Compensation | 3 Months Ended
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Mar. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Disclosure of Compensation Related Costs, Share-based Payments [Text Block] | Note 10 — 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 30, 2018 |  | March 31, 2017 |
Employee stock options |  | $ | 619 |  | $ | 268 |
Restricted stock |  |  | 51 |  |  | 40 |
Restricted stock units |  |  | 598 |  |  | 202 |
Nonemployee stock options |  |  | 33 |  |  | — |
Total |  | $ | 1,301 |  | $ | 510 |
The Company recorded stock-based compensation costs in the following categories on the accompanying Condensed Consolidated Statements of Operations (in thousands):
|  | Three Months Ended |
|  | March 30, 2018 |  | March 31, 2017 |
Cost of sales |  | $ | 3 |  | $ | 2 |
General and administrative |  |  | 519 |  |  | 264 |
Marketing and selling |  |  | 460 |  |  | 116 |
Research and development |  |  | 319 |  |  | 128 |
Total stock-based compensation expense |  |  | 1,301 |  |  | 510 |
Amounts capitalized as part of inventory |  |  | 122 |  |  | 52 |
Total stock-based compensation |  | $ | 1,423 |  | $ | 562 |
Stock Option Plan Our Amended and Restated 2013 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, restricted stock units (“RSUs”), and performance contingent stock units. Options under the plan are granted at fair market value on the date of grant, become exercisable over a three-year period, or as determined by our 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 under certain circumstances in the event of a change in control (as defined in the Plan). Pursuant to the Plan, options for 4,070,281 shares were outstanding at March 30, 2018 with exercise prices ranging between $0.95 and $17.62 per share. Restricted stock grants under the Plan generally vest over a period between one to three years. There were 21,143 shares of restricted stock and 379,901 RSUs outstanding at March 30, 2018. As of March 30, 2018, there were 653,076 shares available for grants 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 11% 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 30, 2018 |  |  | March 31, 2017 |
Expected dividend yield |  |  | 0 | % |  |  | 0 | %
Expected volatility |  |  | 53 | % |  |  | 57 | %
Risk-free interest rate |  |  | 2.61 | % |  |  | 1.96 | %
Expected term (in years) |  |  | 5.72 |  |  |  | 5.67 |
A summary of option activity under the Plan for the quarter ended March 30, 2018 is presented below:
|  | Option Shares (000’s) |
Outstanding at December 29, 2017 |  |  | 3,725 |
Granted |  |  | 412 |
Exercised |  |  | (56) |
Forfeited or expired |  |  | (11) |
Outstanding at March 30, 2018 |  |  | 4,070 |
Exercisable at March 30, 2018 |  |  | 2,793 |
A summary of restricted stock and RSU activity under the Plan for the quarter ended March 30, 2018 is presented below:
|  | Restricted Shares (000’s) |  | Restricted Units (000’s) |
Outstanding at December 29, 2017 |  |  | 21 |  |  | 488 |
Granted |  |  | — |  |  | 47 |
Vested |  |  | — |  |  | (152) |
Forfeited or expired |  |  | — |  |  | (3) |
Outstanding at March 30, 2018 |  |  | 21 |  |  | 380

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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