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Stockholders' Equity (Tables) | 12 Months Ended
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Jan. 03, 2014
Schedule of Employee Service Share-based Compensation [Line Items] |
Schedule Of Compensation Cost [Table Text Block] | Stock-based compensation expense is set forth below (in thousands):
|  | Fiscal Year Ended |
|  | January 3, 2014 |  | December 28, 2012 |  | December 30, 2011 |
Employee stock options |  | $ | 2,683 |  | $ | 2,595 |  | $ | 1,361 |
Restricted stock |  |  | 999 |  |  | 590 |  |  | 466 |
Restricted stock units |  |  | 589 |  |  | — |  |  | — |
Consultant compensation |  |  | 218 |  |  | 23 |  |  | 87 |
Total |  | $ | 4,489 |  | $ | 3,208 |  | $ | 1,914 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The risk-free rate for periods within the contractual life of the option is based on the U.S. Treasury yield curve in effect at the time of grant. Following are the weighted-average assumptions used with the Black-Scholes option-pricing model to determine the fair value estimates of options granted:
|  | Fiscal Year Ended |
|  | January 3, 2014 |  |  | December 28, 2012 |  |  | December 30, 2011 |
Expected dividend yield |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Expected volatility |  |  | 71 | % |  |  | 79 | % |  |  | 77 | %
Risk-free interest rate |  |  | 0.73 | % |  |  | 0.82 | % |  |  | 1.82 | %
Expected term (in years) |  |  | 4.12 |  |  |  | 5.21 |  |  |  | 5.49 |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | A summary of option activity under the Plan as of January 3, 2014 is presented below:
Options |  |  | Shares (000’s) |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term |  |  | Aggregate Intrinsic Value (000’s) |
Outstanding at December 28, 2012 |  |  | 3,376 |  | $ | 5.89 |  |  |  |  |  |  |
Granted |  |  | 603 |  |  | 6.77 |  |  |  |  |  |  |
Exercised |  |  | (645) |  |  | 5.10 |  |  |  |  |  |  |
Forfeited or expired |  |  | (35) |  |  | 8.53 |  |  |  |  |  |  |
Outstanding at January 3, 2014 |  |  | 3,299 |  | $ | 6.17 |  |  | 6.27 |  | $ | 32,745 |
Exercisable at January 3, 2014 |  |  | 2,168 |  | $ | 5.30 |  |  | 5.04 |  |  | 23,405 |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block] | The fair value of the warrants was estimated on the issuance date, June 1, 2009, using a Black-Scholes option valuation model applying the assumptions noted in the following table:
|  | As of June 1, 2009 |
Common stock price per share |  | $ | 1.01 |
Number of warrants |  |  | 700,000 |
Expected dividends |  |  | 0 | %
Expected volatility |  |  | 74.4 | %
Risk-free rate |  |  | 3.28 | %
Life (in years) |  |  | 6.0 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] | The following table summarizes information about stock options outstanding and exercisable at January 3, 2014 (in thousands, except per share data):
Range of Exercise Prices | Number Outstanding at January 3, 2014 |  | Options Outstanding Weighted-Average Remaining Contractual Life |  | Weighted- Average Exercise Price | Number Exercisable at January 3, 2014 |  | Weighted- Average Exercise Price |
$ | 0.95 |  |  | 29 |  | 5.24 Years |  | $ | 0.95 |  |  | 29 |  | $ | 0.95 |
$ | 1.56 to $2.30 |  |  | 320 |  | 4.30 Years |  | $ | 2.19 |  |  | 320 |  | $ | 2.19 |
$ | 2.45 to $3.60 |  |  | 177 |  | 5.48 Years |  | $ | 3.29 |  |  | 177 |  | $ | 3.29 |
$ | 3.75 to $5.29 |  |  | 506 |  | 3.16 Years |  | $ | 4.22 |  |  | 497 |  | $ | 4.20 |
$ | 5.34 to $7.32 |  |  | 1,457 |  | 6.96 Years |  | $ | 5.71 |  |  | 817 |  | $ | 5.89 |
$ | 7.50 to $13.34 |  |  | 810 |  | 7.94 Years |  | $ | 10.61 |  |  | 328 |  | $ | 10.00 |
|  |  |  | 3,299 |  | 6.27 Years |  | $ | 6.17 |  |  | 2,168 |  | $ | 5.30 |
Schedule Of Warrant Activity [Table Text Block] | A summary of warrants to purchase Company stock issued to Broadwood as discussed in Note 9 as of January 3, 2014 is presented below:
Warrants |  | Shares (000’s) |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term |  | Aggregate Intrinsic Value (000’s) |
Outstanding at December 28, 2012 |  |  | 1,470 |  | $ | 4.10 |  |  |  |  |  |  |
Granted |  |  | — |  |  | — |  |  |  |  |  |  |
Exercised |  |  | 700 |  |  | 4.00 |  |  |  |  |  |  |
Forfeited or expired |  |  | 70 |  |  | 6.00 |  |  |  |  |  |  |
Outstanding at January 3, 2014 |  |  | 700 |  | $ | 4.00 |  |  | 1.41 |  | $ | 8,470 |
Exercisable at January 3, 2014 |  |  | 700 |  | $ | 4.00 |  |  | 1.41 |  | $ | 8,470
Restricted Stock [Member] |
Schedule of Employee Service Share-based Compensation [Line Items] |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] | A summary of restricted stock as of January 3, 2014 is presented below:
Restricted Stock |  | Shares (000’s) |  |  | Weighted Average Grant-Date Fair Value per Share |
Outstanding at December 28, 2012 |  |  | 205 |  |  | $ | 8.48 |
Granted |  |  | 154 |  |  |  | 6.58 |
Forfeited |  |  | — |  |  |  | — |
Vested |  |  | (18) |  |  |  | 9.90 |
Outstanding at January 3, 2014 |  |  | 341 |  |  | $ | 7.55 |
Restricted Stock Units (RSUs) [Member] |
Schedule of Employee Service Share-based Compensation [Line Items] |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] | A summary of restricted stock units as of January 3, 2014 is presented below:
|  | Units (000’s) |  |  | Weighted Average Grant-Date Fair Value per Share |
Outstanding at December 28, 2012 |  |  | — |  |  | $ | — |
Granted |  |  | 135 |  |  |  | 5.34 |
Forfeited |  |  | — |  |  |  | — |
Vested |  |  | — |  |  |  | — |
Outstanding at January 3, 2014 |  |  | 135 |  |  | $ | 5.34 |

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- Definition Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, applied during the period to each separate class of assets, liabilities, and financial instruments classified in shareholders' equity that are measured on a recurring and/or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + 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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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&loc=d3e5070-113901 + Details
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