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Stockholders' Equity and Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 29, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stock-Based Compensation Expenses | The following table shows stock-based compensation expenses included in the condensed consolidated statements of operations for the three and nine months ended September 29, 2018 and September 30, 2017:
|  | Three Months Ended |  |  | Nine Months Ended |
(in thousands) |  | September 29, 2018 |  |  | September 30, 2017 |  |  | September 29, 2018 |  |  | September 30, 2017 |
Cost of revenues |  | $ | 23 |  |  | $ | 39 |  |  | $ | 68 |  |  | $ | 131 |
Research and development |  |  | 94 |  |  |  | 104 |  |  |  | 214 |  |  |  | 215 |
Sales and marketing |  |  | 169 |  |  |  | 59 |  |  |  | 348 |  |  |  | 238 |
General and administrative |  |  | 387 |  |  |  | 319 |  |  |  | 886 |  |  |  | 773 |
|  | $ | 673 |  |  | $ | 521 |  |  | $ | 1,516 |  |  | $ | 1,357 |
Summary of Activity under Incentive Plan | The following table summarizes information regarding activity under the Incentive Plan during the nine months ended September 29, 2018:
|  | Number of Shares |  |  | Weighted Average Exercise Price Per Share |  |  | Aggregate Intrinsic Value (thousands) |
Outstanding as of December 30, 2017 |  |  | 857,311 |  |  | $ | 9.49 |  |  |  |  |
Granted |  |  | 136,435 |  |  | $ | 6.22 |  |  |  |  |
Exercised |  |  | (23,750 | ) |  | $ | 4.10 |  |  |  |  |
Canceled or forfeited |  |  | (62,286 | ) |  | $ | 10.48 |  |  |  |  |
Outstanding as of September 29, 2018 |  |  | 907,710 |  |  | $ | 9.07 |  |  | $ | 132 |
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 29, 2018 |  |  | September 30, 2017 |  |  | September 29, 2018 |  |  | September 30, 2017 |
Average risk free interest rate |  |  | 2.95 | % |  |  | 1.80 | % |  |  | 2.71 | % |  |  | 1.79 | %
Expected life (in years) |  | 4.55 years |  |  | 4.55 years |  |  | 4.55 years |  |  | 4.55 years |
Dividend yield |  | —% |  |  | —% |  |  | —% |  |  | —% |
Average volatility |  |  | 41 | % |  |  | 42 | % |  |  | 41 | % |  |  | 42 | %
Summary of Stock Options Outstanding, Vested, Expected to Vest and Exercisable | Information regarding stock options outstanding, vested, expected to vest, and exercisable as of September 29, 2018 is summarized below:
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Life (Years) |  |  | Aggregate Intrinsic Value (thousands) |
Options outstanding |  |  | 907,710 |  |  | $ | 9.07 |  |  |  | 5.06 |  |  | $ | 132 |
Options vested and expected to vest |  |  | 848,436 |  |  | $ | 9.09 |  |  |  | 5.00 |  |  | $ | 126 |
Options exercisable |  |  | 384,468 |  |  | $ | 9.07 |  |  |  | 3.87 |  |  | $ | 87 |
Restricted Stock Units and Awards | Information regarding the restricted stock units (“RSUs”) activity for the nine months ended September 29, 2018 is summarized below:
|  | Number of Shares |
Outstanding as of December 30, 2017 |  |  | 361,148 |
Restricted stock units granted |  |  | 408,750 |
Restricted stock units released |  |  | (76,399 | )
Restricted stock units forfeited |  |  | (6,750 | )
Outstanding as of September 29, 2018 |  |  | 686,749 |
Information regarding the restricted stock awards activity during the nine months ended September 29, 2018 is summarized below:
|  | Number of Shares |
Outstanding as of December 30, 2017 |  |  | 4,301 |
Restricted stock awards granted |  |  | — |
Restricted stock awards released |  |  | (4,301 | )
Outstanding as of September 29, 2018 |  |  | — |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&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 number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for exercisable or convertible options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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