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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2016
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 2016, 2015 and 2014 (in thousands except share and per share data):
|  |  |  |  |  | Outstanding Options |
|  | Shares Available for Grant |  |  | Number of Shares |  |  | Weighted Average Exercise Price |
Balances as of December 28, 2013 |  |  | 476,545 |  |  |  | 1,102,842 |  |  |  | 3.97 |
Additional shares reserved |  |  | 503,306 |  |  |  | — |  |  |  | — |
Options granted |  |  | (158,300 | ) |  |  | 158,300 |  |  |  | 8.61 |
Restricted stock granted |  |  | (62,225 | ) |  |  | — |  |  |  | — |
Options exercised |  |  | — |  |  |  | (399,390 | ) |  |  | 3.76 |
Options cancelled |  |  | 27,957 |  |  |  | (27,957 | ) |  |  | 6.13 |
Awards cancelled |  |  | 79,890 |  |  |  | — |  |  |  | — |
Options expired |  |  | (13,056 | ) |  |  | — |  |  |  | — |
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 |
Stock Options Outstanding and Exercisable | The following table summarizes information with respect to stock options outstanding and exercisable as of December 31, 2016:
|  | 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 - $3.92 |  |  | 47,935 |  |  |  | 2.18 |  |  | $ | 3.84 |  |  |  | 47,164 |  |  | $ | 3.84 |
$3.95 - $5.92 |  |  | 73,182 |  |  |  | 2.87 |  |  | $ | 5.01 |  |  |  | 60,241 |  |  | $ | 4.86 |
$6.00 - $8.16 |  |  | 82,169 |  |  |  | 5.19 |  |  | $ | 7.38 |  |  |  | 35,615 |  |  | $ | 7.08 |
$8.29 - $8.58 |  |  | 60,799 |  |  |  | 4.17 |  |  | $ | 8.45 |  |  |  | 38,325 |  |  | $ | 8.45 |
$8.60 - $10.33 |  |  | 59,500 |  |  |  | 4.96 |  |  | $ | 9.39 |  |  |  | 27,067 |  |  | $ | 9.10 |
$10.45 - $10.45 |  |  | 400 |  |  |  | 5.17 |  |  | $ | 10.45 |  |  |  | 200 |  |  | $ | 10.45 |
$10.73 - $10.73 |  |  | 61,223 |  |  |  | 5.15 |  |  | $ | 10.73 |  |  |  | 26,098 |  |  | $ | 10.73 |
$11.04 - $11.04 |  |  | 15,800 |  |  |  | 5.17 |  |  | $ | 11.04 |  |  |  | 885 |  |  | $ | 11.04 |
$12.85 - $12.85 |  |  | 32,500 |  |  |  | 6.82 |  |  | $ | 12.85 |  |  |  | 118 |  |  | $ | 12.85 |
$16.29 - $16.29 |  |  | 37,477 |  |  |  | 6.57 |  |  | $ | 16.29 |  |  |  | 686 |  |  | $ | 16.29 |
$3.46 - $16.29 |  |  | 470,985 |  |  |  | 4.58 |  |  | $ | 8.69 |  |  |  | 236,399 |  |  | $ | 6.77 |
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 2016 |  |  | FY 2015 |  |  | FY 2014 |
Average risk free interest rate |  |  | 1.33 | % |  |  | 1.38 | % |  |  | 1.49 | %
Expected life (in years) |  | 4.55 years |  |  | 4.55 years |  |  | 4.50 years |
Dividend yield |  |  | — |  |  |  | — |  |  |  | — |
Average volatility |  |  | 44.5 | % |  |  | 49.3 | % |  |  | 56.2 | %
Stock-Based Compensation Expense | The following table shows stock-based compensation expense by functional line item in the consolidated statements of operations for 2016, 2015 and 2014 (in thousands):
|  | FY 2016 Year Ended |  |  | FY 2015 Year Ended |  |  | FY 2014 Year Ended |
|  | December 31, 2016 |  |  | January 2, 2016 |  |  | January 3, 2015 |
Cost of revenues |  | $ | 119 |  |  | $ | 223 |  |  | $ | 149 |
Research and development |  |  | 134 |  |  |  | 176 |  |  |  | 105 |
Sales and marketing |  |  | 164 |  |  |  | 185 |  |  |  | 118 |
General and administrative |  |  | 1,404 |  |  |  | 311 |  |  |  | 600 |
Total stock-based compensation expense |  | $ | 1,821 |  |  | $ | 895 |  |  | $ | 972 |
Stock Options Outstanding, Exercisable and Expected to Vest | Information regarding stock options outstanding, exercisable and expected to vest as of December 31, 2016 is summarized below:
|  | Number of |  |  | Weighted Average |  |  | Weighted Average Remaining Contractual |  |  | Aggregate Intrinsic Value |
|  | Shares |  |  | Exercise Price |  |  | Life (years) |  |  | (thousands) |
Options outstanding |  |  | 470,985 |  |  | $ | 8.69 |  |  |  | 4.58 |  |  | $ | 2,611 |
Options vested and expected to vest |  |  | 436,564 |  |  | $ | 8.48 |  |  |  | 4.48 |  |  | $ | 2,505 |
Options exercisable |  |  | 236,399 |  |  | $ | 6.77 |  |  |  | 3.66 |  |  | $ | 1,725 |
Restricted Stock Units Outstanding, Vested and Expected to Vest | Information regarding the restricted stock units outstanding, vested and expected to vest as of December 31, 2016 is summarized below:
|  | Number of Shares |  |  | Weighted Average Remaining Contractual Life (years) |  |  | Aggregate Intrinsic Value (thousands) |
Restricted stock units outstanding |  |  | 335,805 |  |  |  | 1.95 |  |  | $ | 4,721 |
Restricted stock units vested and expected to vest |  |  | 218,412 |  |  |  | 1.87 |  |  | $ | 3,071 |
Restricted Stock Units and Awards | Information regarding the RSU activity during the years ended December 31, 2016, January 2, 2016 and January 3, 2015 is summarized below:
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Outstanding as of December 28, 2013 |  |  | 269,259 |  |  | $ | 4.42 |
Restricted stock units granted |  |  | 59,780 |  |  | $ | 9.76 |
Restricted stock units released |  |  | (46,759 | ) |  | $ | 4.29 |
Restricted stock units forfeited |  |  | (4,890 | ) |  | $ | 8.18 |
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 |
Information regarding the restricted stock awards activity during the year ended December 31, 2016, January 2, 2016 and January 3, 2015 is summarized below:
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Outstanding as of December 28, 2013 |  |  | 3,503 |  |  | $ | 5.71 |
Restricted stock awards granted |  |  | 2,445 |  |  | $ | 8.18 |
Restricted stock awards released |  |  | (3,503 | ) |  | $ | 5.71 |
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 |

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