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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 30, 2017
Equity [Abstract] |
Summary of Activity in Stock Option Plan | The following table summarizes information regarding activity in our stock option plans during the fiscal years ended 2017, 2016 and 2015 (in thousands except share and per share data):
|  |  |  |  |  | Outstanding Options |
|  | Shares Available for Grant |  |  | Number of Shares |  |  | Weighted Average Exercise Price |
Balances as of January 3, 2015 |  |  | 854,117 |  |  |  | 833,795 |  |  | $ | 4.88 |
Additional shares reserved |  |  | 1,000 |  |  |  | — |  |  |  | — |
Options granted |  |  | (170,300 | ) |  |  | 170,300 |  |  |  | 9.38 |
Restricted stock granted |  |  | (227,905 | ) |  |  | — |  |  |  | — |
Options exercised |  |  | — |  |  |  | (277,733 | ) |  |  | 3.70 |
Options cancelled |  |  | 174,870 |  |  |  | (174,870 | ) |  |  | 4.71 |
Awards cancelled |  |  | 146,000 |  |  |  | — |  |  |  | — |
Options expired |  |  | (7,000 | ) |  |  | — |  |  |  | — |
Balances as of January 2, 2016 |  |  | 770,782 |  |  |  | 551,492 |  |  |  | 6.92 |
Additional shares reserved |  |  | — |  |  |  | — |  |  |  | — |
Options granted |  |  | (112,277 | ) |  |  | 112,277 |  |  |  | 13.71 |
Restricted stock granted |  |  | (286,294 | ) |  |  | — |  |  |  | — |
Options exercised |  |  | — |  |  |  | (126,077 | ) |  |  | 5.62 |
Options cancelled |  |  | 66,707 |  |  |  | (66,707 | ) |  |  | 7.37 |
Awards cancelled |  |  | 66,000 |  |  |  | — |  |  |  | — |
Options expired |  |  | - |  |  |  | — |  |  |  | — |
Balances as of December 31, 2016 |  |  | 504,918 |  |  |  | 470,985 |  |  |  | 8.69 |
Additional shares reserved |  |  | 650,000 |  |  |  | — |  |  |  | — |
Options granted |  |  | (524,400 | ) |  |  | 524,400 |  |  |  | 9.90 |
Restricted stock granted |  |  | (141,692 | ) |  |  | — |  |  |  | — |
Options exercised |  |  | — |  |  |  | (64,380 | ) |  |  | 5.86 |
Options cancelled |  |  | 73,694 |  |  |  | (73,694 | ) |  |  | 10.47 |
Awards cancelled |  |  | 32,039 |  |  |  | — |  |  |  | — |
Options expired |  |  | — |  |  |  | — |  |  |  | — |
Balances as of December 30, 2017 |  |  | 594,559 |  |  |  | 857,311 |  |  | $ | 9.49 |
Stock Options Outstanding and Exercisable | The following table summarizes information with respect to stock options outstanding and exercisable as of December30, 2017
|  | Options Outstanding |  |  | Options Vested and Exercisable |
Range of Exercise Prices |  | Number of Shares Outstanding |  |  | Weighted Average Remaining Contractual Life (years) |  |  | Weighted Average Exercise Price |  |  | Number of Shares Exercisable |  |  | Weighted Average Exercise Price |
$3.46 - $6.30 |  |  | 97,542 |  |  |  | 2.11 |  |  | $ | 4.94 |  |  |  | 97,542 |  |  | $ | 4.94 |
$6.83 - $8.58 |  |  | 96,655 |  |  |  | 4.13 |  |  | $ | 7.93 |  |  |  | 61,551 |  |  | $ | 8.06 |
$8.60 - $9.40 |  |  | 84,000 |  |  |  | 5.82 |  |  | $ | 9.06 |  |  |  | 25,202 |  |  | $ | 8.87 |
$9.54 - $9.54 |  |  | 385,000 |  |  |  | 6.56 |  |  | $ | 9.54 |  |  |  | 32,709 |  |  | $ | 9.54 |
$10.14 - $10.73 |  |  | 69,374 |  |  |  | 4.25 |  |  | $ | 10.62 |  |  |  | 45,774 |  |  | $ | 10.63 |
$11.04 - $11.04 |  |  | 5,300 |  |  |  | 5.32 |  |  | $ | 11.04 |  |  |  | 2,209 |  |  | $ | 11.04 |
$11.16 - $11.16 |  |  | 24,900 |  |  |  | 6.32 |  |  | $ | 11.16 |  |  |  | — |  |  | $ | - |
$12.85 - $12.85 |  |  | 27,500 |  |  |  | 3.66 |  |  | $ | 12.85 |  |  |  | 8,235 |  |  | $ | 12.85 |
$14.61 - $14.61 |  |  | 38,000 |  |  |  | 5.41 |  |  | $ | 14.61 |  |  |  | 5,940 |  |  | $ | 14.61 |
$16.29 - $16.29 |  |  | 29,040 |  |  |  | 5.52 |  |  | $ | 16.29 |  |  |  | 10,674 |  |  | $ | 16.29 |
$3.46 - $16.29 |  |  | 857,311 |  |  |  | 5.33 |  |  | $ | 9.49 |  |  |  | 289,836 |  |  | $ | 8.25 |
Weighted Average Assumptions for Fair Value of Options Granted | The determination of the fair value of options granted is computed using the Black-Scholes option pricing model with the following weighted average assumptions:
|  | Employee Stock Option Plan |
|  | FY 2017 |  |  | FY 2016 |  |  | FY 2015 |
Average risk free interest rate |  |  | 1.83 | % |  |  | 1.33 | % |  |  | 1.38 | %
Expected life (in years) |  | 4.55 years |  |  | 4.55 years |  |  | 4.55 years |
Dividend yield |  |  | — |  |  |  | — |  |  |  | — |
Average volatility |  |  | 41.8 | % |  |  | 44.5 | % |  |  | 49.3 | %
Stock-Based Compensation Expense | The following table shows stock-based compensation expense by functional line item in the consolidated statements of operations for 2017, 2016 and 2015 (in thousands):
|  | FY 2017 |  |  | FY 2016 |  |  | FY 2015 |
|  | Year Ended |  |  | Year Ended |  |  | Year Ended |
|  | December 30, 2017 |  |  | December 31, 2016 |  |  | January 2, 2016 |
Cost of revenues |  | $ | 152 |  |  | $ | 119 |  |  | $ | 223 |
Research and development |  |  | 354 |  |  |  | 134 |  |  |  | 176 |
Sales and marketing |  |  | 307 |  |  |  | 164 |  |  |  | 185 |
General and administrative |  |  | 1,109 |  |  |  | 1,404 |  |  |  | 311 |
Total stock-based compensation expense |  | $ | 1,922 |  |  | $ | 1,821 |  |  | $ | 895 |
Stock Options Outstanding, Exercisable and Expected to Vest | Information regarding stock options outstanding, exercisable and expected to vest as of December 30, 2017 is summarized below:
|  | Number of |  |  | Weighted Average |  |  | Weighted Average Remaining Contractual |  |  | Aggregate Intrinsic Value |
|  | Shares |  |  | Exercise Price |  |  | Life (years) |  |  | (thousands) |
Options outstanding |  |  | 857,311 |  |  | $ | 9.49 |  |  |  | 5.33 |  |  | $ | 278 |
Options vested and expected to vest |  |  | 773,545 |  |  | $ | 9.43 |  |  |  | 5.22 |  |  | $ | 278 |
Options exercisable |  |  | 289,836 |  |  | $ | 8.25 |  |  |  | 3.65 |  |  | $ | 272 |
Restricted Stock Units Outstanding, Vested and Expected to Vest | Information regarding the restricted stock units outstanding, vested and expected to vest as of December 30, 2017 is summarized below:
|  | Number of Shares |  |  | Weighted Average Remaining Contractual Life (years) |  |  | Aggregate Intrinsic Value (thousands) |
Restricted stock units outstanding |  |  | 361,148 |  |  |  | 1.42 |  |  | $ | 2,752 |
Restricted stock units vested and expected to vest |  |  | 314,234 |  |  |  | 1.11 |  |  | $ | 2,394 |
Restricted Stock Units and Awards | Information regarding the RSU activity during the years ended December 30, 2017, December 31, 2016 and January 2, 2016 is summarized below:
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Outstanding as of January 3, 2015 |  |  | 277,390 |  |  | $ | 5.52 |
Restricted stock units granted |  |  | 225,392 |  |  | $ | 8.66 |
Restricted stock units released |  |  | (209,193 | ) |  | $ | 4.82 |
Restricted stock units forfeited |  |  | (146,000 | ) |  | $ | 8.28 |
Outstanding as of January 2, 2016 |  |  | 147,589 |  |  | $ | 8.59 |
Restricted stock units granted |  |  | 285,005 |  |  | $ | 11.89 |
Restricted stock units released |  |  | (30,789 | ) |  | $ | 8.30 |
Restricted stock units forfeited |  |  | (66,000 | ) |  | $ | 9.67 |
Outstanding as of December 31, 2016 |  |  | 335,805 |  |  | $ | 11.20 |
Restricted stock units granted |  |  | 137,391 |  |  | $ | 9.88 |
Restricted stock units released |  |  | (80,009 | ) |  | $ | 12.37 |
Restricted stock units forfeited |  |  | (32,039 | ) |  | $ | 11.44 |
Outstanding as of December 30, 2017 |  |  | 361,148 |  |  | $ | 10.42 |
Information regarding the restricted stock awards activity during the year ended December 30, 2017, December 31, 2016 and January 2, 2016 is summarized below:
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Outstanding as of January 3, 2015 |  |  | 2,445 |  |  | $ | 8.18 |
Restricted stock awards granted |  |  | 2,513 |  |  | $ | 7.96 |
Restricted stock awards released |  |  | (2,445 | ) |  | $ | 7.96 |
Outstanding as of January 2, 2016 |  |  | 2,513 |  |  | $ | 7.96 |
Restricted stock awards granted |  |  | 1,289 |  |  | $ | 15.51 |
Restricted stock awards released |  |  | (2,513 | ) |  | $ | 7.96 |
Outstanding as of December 31, 2016 |  |  | 1,289 |  |  | $ | 15.51 |
Restricted stock awards granted |  |  | 4,301 |  |  | $ | 9.30 |
Restricted stock awards released |  |  | (1,289 | ) |  | $ | 15.51 |
Outstanding as of December 30, 2017 |  |  | 4,301 |  |  | $ | 9.30 |

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