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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule Of Compensation Cost [Table Text Block] | 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 |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] | 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 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | 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 |
Share-based Compensation, Stock Options, Activity [Table Text Block] | 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 |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] | 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 Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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