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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 28, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of employee service share-based compensation, allocation of recognized period costs | The stock-based compensation expense included in the Company's consolidated financial statements for the three and six months ended June 28, 2015 and June 29, 2014 was as follows (in thousands):
| Three Months Ended |  | Six Months Ended
| June 28, 2015 |  | June 29, 2014 |  | June 28, 2015 |  | June 29, 2014
Cost of revenue | $ | 27 |  |  | $ | 36 |  |  | $ | 66 |  |  | $ | 78 |
Research and development | 212 |  |  | 221 |  |  | 403 |  |  | 574 |
Selling, general and administrative | 252 |  |  | 309 |  |  | 519 |  |  | 646 |
Total costs and expenses | $ | 491 |  |  | $ | 566 |  |  | $ | 988 |  |  | $ | 1,298 |
Schedule of share-based payment award, stock options, valuation assumptions | The following weighted average assumptions are included in the estimated fair value calculations for stock option grants:
| Three Months Ended |  | Six Months Ended
| June 28, 2015 |  | June 29, 2014 |  | June 28, 2015 |  | June 29, 2014
Expected term (years) | — |  |  | 6.00 |  |  | 4.78 |  |  | 6.19 |
Risk-free interest rate | — | % |  | 1.90 | % |  | 1.40 | % |  | 1.98 | %
Expected volatility | — | % |  | 55.70 | % |  | 52.11 | % |  | 55.10 | %
Expected dividend yield | — |  |  | — |  |  | — |  |  | — |
Schedule of share-based compensation, activity | The following table summarizes the activity in the shares available for grant under the 2009 Plan during the six months ended June 28, 2015:
| Shares Available for Grant
| (in thousands)
Balance at December 28, 2014 | 1,139 |
Authorized | 2,500 |
Options granted | (80 | )
Options forfeited or expired | 174 |
RSUs granted | (298 | )
PRSUs granted | (20 | )
RSUs forfeited or expired | 35 |
Balance at June 28, 2015 | 3,450 |
Schedule of share-based compensation, stock options, activity | The following table summarizes stock options outstanding and stock option activity under the 1999 Plan and the 2009 Plan, and the related weighted average exercise price, for the first six months of 2015:
| Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Term |  | Aggregate Intrinsic Value
| (in thousands) |  |  |  | (in years) |  | (in thousands)
Balance outstanding at December 28, 2014 | 5,682 |  |  | $ | 2.67 |  |  |  |  |
Granted | 80 |  |  | 2.00 |  |  |  |  |
Forfeited or expired | (174 | ) |  | 3.41 |  |  |  |  |
Exercised | (117 | ) |  | 0.98 |  |  |  |  |
Balance outstanding at June 28, 2015 | 5,471 |  |  | $ | 2.67 |  |  | 4.84 |  | $ | 292 |
Exercisable at June 28, 2015 | 4,631 |  |  | $ | 2.61 |  |  | 4.20 |  | $ | 292 |
Vested and expected to vest at June 28, 2015 | 5,317 |  |  | $ | 2.66 |  |  | 4.72 |  | $ | 292 |
Schedule of share-based compensation, restricted stock and restricted stock units activity | A summary of activity for the Company's RSUs and PRSUs for the six months ended June 28, 2015 and information regarding RSUs and PRSUs outstanding and expected to vest as of June 28, 2015 is as follows:
| RSUs & PRSUs Outstanding
| Number of Shares |  | Weighted Average Grant Date Fair Value
| (in thousands) |  |
Nonvested at December 28, 2014 | 650 |  |  | $ | 3.47 |
Granted | 318 |  |  | 1.85 |
Vested | (54 | ) |  | 2.04 |
Forfeited | (35 | ) |  | — |
Nonvested at June 28, 2015 | 879 |  |  | $ | 3.10 |
Schedule of share-based payment award, employee stock purchase plan, valuation assumption | The fair value of rights issued pursuant to the Company's 2009 ESPP was estimated on the commencement date of each offering period using the following weighted average assumptions:
| Three Months Ended |  | Six Months Ended
| June 28, 2015 |  | June 29, 2014 |  | June 28, 2015 |  | June 29, 2014
Expected term (months) | 6.08 |  |  | 6.09 |  |  | 6.08 |  |  | 6.09 |
Risk-free interest rate | 0.08 | % |  | 0.05 | % |  | 0.08 | % |  | 0.05 | %
Volatility | 51.54 | % |  | 49.17 | % |  | 51.54 | % |  | 49.17 | %
Dividend yield | — |  |  | — |  |  |  |  | — |

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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=6415400&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=6415400&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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + 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 employee stock purchase plans, including, but not limited to: (a) expected term, (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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- 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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- 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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