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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2018
Disclosure Of Compensation Related Costs Sharebased 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 nine-months ended September 30, 2018 and October 1, 2017 was as follows (in thousands):
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, 2018 |  |  | October 1, 2017 |  |  | September 30, 2018 |  |  | October 1, 2017 |
Cost of revenue |  | $ | 30 |  |  | $ | 32 |  |  | $ | 99 |  |  | $ | 85 |
Research and development |  |  | 220 |  |  |  | 151 |  |  |  | 610 |  |  |  | 424 |
Selling, general and administrative |  |  | 266 |  |  |  | 212 |  |  |  | 718 |  |  |  | 551 |
Total costs and expenses |  | $ | 516 |  |  | $ | 395 |  |  | $ | 1,427 |  |  | $ | 1,060 |
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 nine months ended September 30, 2018:
|  | Shares Available for Grant |
|  | (in thousands) |
Balance at December 31, 2017 |  |  | 3,899 |
Authorized |  |  | 4,000 |
RSUs granted |  |  | (1,389 | )
RSUs forfeited or expired |  |  | 151 |
Options forfeited |  |  | 50 |
Balance at September 30, 2018 |  |  | 6,711 |
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 nine months of 2018:
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Term |  |  | Aggregate Intrinsic Value |
|  | (in thousands) |  |  |  |  |  |  | (in years) |  |  | (in thousands) |
Balance outstanding at December 31, 2017 |  |  | 3,558 |  |  | $ | 2.09 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (50 | ) |  |  |  |  |  |  |  |  |  |  |  |
Exercised |  |  | (5 | ) |  |  | — |  |  |  |  |  |  |  |  |
Balance outstanding at September 30, 2018 |  |  | 3,503 |  |  | $ | 2.08 |  |  |  | 3.64 |  |  | $ | 131 |
Exercisable at September 30, 2018 |  |  | 3,116 |  |  | $ | 2.22 |  |  |  | 3.11 |  |  | $ | 80 |
Vested and expected to vest at September 30, 2018 |  |  | 3,441 |  |  | $ | 2.10 |  |  |  | 3.56 |  |  | $ | 122 |
Summary of activity for RSUs and PRSUs | A summary of activity for the Company's RSUs for the nine months ended September 30, 2018 and information regarding RSUs outstanding and expected to vest as of September 30, 2018 is as follows:
|  | RSUs & PRSUs Outstanding |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
|  | (in thousands) |  |  |  |  |
Nonvested at December 31, 2017 |  |  | 2,363 |  |  | $ | 1.54 |
Granted |  |  | 1,388 |  |  |  | 1.50 |
Vested |  |  | (827 | ) |  |  | 1.28 |
Forfeited |  |  | (150 | ) |  |  | — |
Nonvested at September 30, 2018 |  |  | 2,774 |  |  | $ | 1.59 |
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 |  |  | Nine Months Ended |
|  | September 30, 2018 |  |  | October 1, 2017 |  |  | September 30, 2018 |  |  | October 1, 2017 |
Expected term (months) |  |  | 6.00 |  |  |  | 6.0 |  |  |  | 6.00 |  |  |  | 6.00 |
Risk-free interest rate |  |  | 2.09 | % |  |  | 1.02 | % |  |  | 2.09 | % |  |  | 1.02 | %
Volatility |  |  | 44.76 | % |  |  | 49.71 | % |  |  | 44.76 | % |  |  | 49.71 | %
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://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 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://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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