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Stock Based Compensation (Tables) | 9 Months Ended
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Sep. 27, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Activity in Stock Option Plan | The following table summarizes information regarding activity in our stock option plan during the nine months ended September 27, 2014:
| Number of Shares |  |  | Weighted Average Exercise Price Per Share |  |  | Aggregate Intrinsic Value (thousands) |
Outstanding as of December 28, 2013 |  | 1,102,842 |  |  | $ | 3.97 |  |  |  |  |
Granted |  | 135,900 |  |  | $ | 8.66 |  |  |  |  |
Exercised |  | (296,459 | ) |  | $ | 3.99 |  |  |  |  |
Canceled or forfeited |  | (27,457 | ) |  | $ | 6.16 |  |  |  |  |
Outstanding as of September 27, 2014 |  | 914,826 |  |  | $ | 4.60 |  |  | $ | 2,535 |
Weighted Average Assumptions for Fair Value Estimate of Stock-Based Awards (Options) | The Company uses the Black-Scholes option-pricing model to estimate fair value of stock-based awards (options) with the following weighted average assumptions:
| Three Months Ended |  |  | Nine Months Ended |
| September 27, 2014 |  |  | September 28, 2013 |  |  | September 27, 2014 |  |  | September 28, 2013 |
Average risk free interest rate |  | 1.56 | % |  |  | 1.26 | % |  |  | 1.49 | % |  |  | 1.11 | %
Expected life (in years) |  | 4.5 years |  |  |  | 4.5 years |  |  |  | 4.5 years |  |  |  | 4.5 years |
Dividend yield |  | — | % |  |  | — | % |  |  | — | % |  |  | — | %
Average volatility |  | 54 | % |  |  | 66 | % |  |  | 56 | % |  |  | 72 | %
Stock-Based Compensation Expense | The following table shows stock-based compensation expense included in the condensed consolidated statements of operations for the three and nine months ended September 27, 2014 and September 28, 2013:
| Three Months Ended |  |  | Nine Months Ended |
| September 27, 2014 |  |  | September 28, 2013 |  |  | September 27, 2014 |  |  | September 28, 2013 |
Cost of revenues | $ | 37 |  |  | $ | 27 |  |  | $ | 110 |  |  | $ | 78 |
Research and development |  | 27 |  |  |  | 17 |  |  |  | 75 |  |  |  | 53 |
Sales and marketing |  | 26 |  |  |  | 30 |  |  |  | 86 |  |  |  | 80 |
General and administrative |  | 154 |  |  |  | 103 |  |  |  | 451 |  |  |  | 300 |
Total | $ | 244 |  |  | $ | 177 |  |  | $ | 722 |  |  | $ | 511 |
Summary of Stock Options Outstanding, Vested and Expected to Vest and Exercisable | Information regarding stock options outstanding, vested and expected to vest and exercisable as of September 27, 2014 is summarized below:
| Number of Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Life (Years) |  |  | Aggregate Intrinsic Value (thousands) |
Options outstanding |  | 914,826 |  |  | $ | 4.60 |  |  |  | 4.09 |  |  | $ | 2,535 |
Options vested and expected to vest |  | 855,313 |  |  | $ | 4.48 |  |  |  | 3.97 |  |  | $ | 2,448 |
Options exercisable |  | 513,636 |  |  | $ | 3.62 |  |  |  | 2.91 |  |  | $ | 1,815 |
Restricted Stock Units and Awards | Information regarding the restricted stock units activity for the nine months ended September 27, 2014 is summarized below:
| Number of Shares |
Outstanding as of December 28, 2013 |  | 269,259 |
Restricted stock units granted |  | 59,780 |
Restricted stock units released |  | (46,759 | )
Restricted stock units cancelled |  | (2,445 | )
Outstanding as of September 27, 2014 |  | 279,835 |
Information regarding the restricted stock awards activity for the nine months ended September 27, 2014 is summarized below:
| Number of Shares |
Outstanding as of December 28, 2013 |  | 3,503 |
Restricted stock awards granted |  | 2,445 |
Restricted stock awards released |  | (3,503 | )
Outstanding as of September 27, 2014 |  | 2,445 |

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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 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 4: 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 + 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 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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- Definition Tabular disclosure of the following for fully vested share options (or share units) and share options expected to vest at the date of the latest statement of financial position: the number, weighted-average exercise price (or conversion ratio), aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term of options (or share units) currently exercisable (or convertible). + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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