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Stock-Based Compensation (Tables) | 6 Months Ended
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Jul. 02, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of stock based compensation expense | The stock-based compensation expense included in the Company's consolidated financial statements for the three and six months ended July 2, 2017 and July 3, 2016 was as follows (in thousands):
| Three Months Ended |  | Six Months Ended
| July 2, 2017 |  | July 3, 2016 |  | July 2, 2017 |  | July 3, 2016
Cost of revenue | $ | 20 |  |  | $ | 47 |  |  | $ | 53 |  |  | $ | 85 |
Research and development | 134 |  |  | 175 |  |  | 273 |  |  | 466 |
Selling, general and administrative | 193 |  |  | 217 |  |  | 339 |  |  | 450 |
Total costs and expenses | $ | 347 |  |  | $ | 439 |  |  | $ | 665 |  |  | $ | 1,001 |
Summary of the activity in the shares available for grant under the 2009 plan | The following table summarizes the activity in the shares available for grant under the 2009 Plan during the six months ended July 2, 2017:
| Shares Available for Grant
| (in thousands)
Balance at January 1, 2017 | 2,632 |
Authorized | 1,500 |
Options forfeited or expired | 117 |
RSUs granted | (378 | )
RSUs forfeited or expired | 107 |
Balance at July 2, 2017 | 3,978 |
Summary of stock options outstanding and stock option activity under the 1999 plan and the 2009 plan, and the related weighted average exercise price | The following table summarizes stock options outstanding and stock option activity under the 2009 Plan, and the related weighted average exercise price, for the first six months of 2017:
| Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Term |  | Aggregate Intrinsic Value
| (in thousands) |  |  |  | (in years) |  | (in thousands)
Balance outstanding at January 1, 2017 | 4,979 |  |  | $ | 2.35 |  |  |  |  |
Forfeited or expired | (117 | ) |  | $ | 2.96 |  |  |  |  |
Exercised | (53 | ) |  | 1.31 |  |  |  |  |
Balance outstanding at July 2, 2017 | 4,809 |  |  | $ | 2.35 |  |  | 3.64 |  | $ | 656 |
Exercisable at July 2, 2017 | 3,968 |  |  | $ | 2.61 |  |  | 2.52 |  | $ | 216 |
Vested and expected to vest at July 2, 2017 | 4,636 |  |  | $ | 2.39 |  |  | 3.44 |  | $ | 560 |
Summary of activity for RSUs and PRSUs | A summary of activity for the Company's RSUs and PRSUs for the six months ended July 2, 2017 and information regarding RSUs and PRSUs outstanding and expected to vest as of July 2, 2017 is as follows:
| RSUs & PRSUs Outstanding
| Number of Shares |  | Weighted Average Grant Date Fair Value
| (in thousands) |  |
Nonvested at January 1, 2017 | 1,370 |  |  | $ | 1.68 |
Granted | 378 |  |  | 1.57 |
Vested | (283 | ) |  | 1.31 |
Forfeited | (107 | ) |  | — |
Nonvested at July 2, 2017 | 1,358 |  |  | $ | 1.72 |
Summary of the fair value of rights issued pursuant to ESPP | 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
| July 2, 2017 |  | July 3, 2016 |  | July 2, 2017 |  | July 3, 2016
Expected term (months) | 6.00 |  |  | 6.08 |  |  | 6.00 |  |  | 6.08 |
Risk-free interest rate | 1.02 | % |  | 0.40 | % |  | 1.02 | % |  | 1.04 | %
Volatility | 49.71 | % |  | 54.31 | % |  | 49.71 | % |  | 61.06 | %
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=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 share-based compensation 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 (c)(2) -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 (d) -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 (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + 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 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=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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