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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Schedule of stock based compensation expense | Stock-based compensation expense included in the Company's consolidated financial statements for the three months ended March 31, 2019 and April 1, 2018 was as follows (in thousands):
|  | Three Months Ended |
|  | March 31, 2019 |  |  | April 1, 2018 |
Cost of revenue |  | $ | 26 |  |  | $ | 34 |
Research and development |  |  | 655 |  |  |  | 183 |
Selling, general and administrative |  |  | 270 |  |  |  | 215 |
Total costs and expenses |  | $ | 951 |  |  | $ | 432 |
Summary of the activity in the shares available for grant | The following table summarizes the activity in the shares available for grant under the 2009 Stock Plan during the three months ended March 31, 2019:
|  | Shares Available for Grant |
|  | (in thousands) |
Balance at December 30, 2018 |  |  | 6,760 |
Authorized |  |  | - |
RSUs granted |  |  | (3,144 | )
RSUs forfeited or expired |  |  | 158 |
Options forfeited |  |  | 20 |
Balance at March 31, 2019 |  |  | 3,794 |
Summary of stock options outstanding and stock option activity 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 three months ended March 31, 2019:
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Term |  |  | Aggregate Intrinsic Value |
|  | (in thousands) |  |  |  |  |  |  | (in years) |  |  | (in thousands) |
Balance outstanding at December 30, 2018 |  |  | 3,201 |  |  | $ | 2.18 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (20 | ) |  |  | 3.12 |  |  |  |  |  |  |  |  |
Exercised |  |  | (4 | ) |  |  | 0.78 |  |  |  |  |  |  |  |  |
Balance outstanding at March 31, 2019 |  |  | 3,177 |  |  | $ | 2.18 |  |  |  | 3.48 |  |  | $ | - |
Exercisable at March 31, 2019 |  |  | 2,894 |  |  | $ | 2.30 |  |  |  | 3.09 |  |  | $ | - |
Vested and expected to vest at March 31, 2019 |  |  | 3,144 |  |  | $ | 2.19 |  |  |  | 3.44 |  |  | $ | - |
Summary of activity for RSUs and PRSUs | A summary of activity for the Company's RSUs for the three months ended March 31, 2019 and information regarding RSUs outstanding and expected to vest as of March 31, 2019 is as follows:
|  | RSUs & PRSUs Outstanding |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
|  | (in thousands) |  |  |  |  |
Nonvested at December 30, 2018 |  |  | 2,570 |  |  | $ | 1.23 |
Granted |  |  | 3,143 |  |  |  | 0.87 |
Vested |  |  | (697 | ) |  |  | 1.06 |
Forfeited |  |  | (158 | ) |  |  | — |
Nonvested at March 31, 2019 |  |  | 4,858 |  |  | $ | 1.09 |
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 |
|  | March 31, 2019 |  |  | April 1, 2018 |
Expected term (months) |  |  | 6.0 |  |  |  | 6.0 |
Risk-free interest rate |  |  | 2.37 | % |  |  | 1.39 | %
Volatility |  |  | 53.77 | % |  |  | 54.87 | %
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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