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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 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 and six months ended June 30, 2019 and July 1, 2018 was as follows (in thousands):
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, 2019 |  |  | July 1, 2018 |  |  | June 30, 2019 |  |  | July 1, 2018 |
Cost of revenue |  | $ | 18 |  |  | $ | 35 |  |  | $ | 44 |  |  | $ | 69 |
Research and development |  |  | 532 |  |  |  | 207 |  |  |  | 1,187 |  |  |  | 390 |
Selling, general and administrative |  |  | 241 |  |  |  | 237 |  |  |  | 511 |  |  |  | 452 |
Total costs and expenses |  | $ | 791 |  |  | $ | 479 |  |  | $ | 1,742 |  |  | $ | 911 |
Summary of the activity in the shares available for grant | The following table summarizes the activity in the shares available for grant under the 2019 Plan and 2009 Plan during the six months ended June 30, 2019 (in thousands):
| Shares available for grants |
| 2019 Plan |  |  | 2009 Plan |
Balance at December 30, 2018 |  | - |  |  |  | 6,760 |
Authorized |  | 5,000 |  |  |  | - |
RSUs granted |  | (794 | ) |  |  | (3,355 | )
RSUs forfeited or expired |  | 184 |  |  |  | 762 |
Options forfeited |  | 15 |  |  |  | 20 |
Plan shares expired |  | - |  |  |  | (4,187 | )
Balance at June 30, 2019 |  | 4,405 |  |  |  | - |
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 2019 Plan, and the related weighted average exercise price, for the six months ended June 30, 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 |  |  | (580 | ) |  |  |  |  |  |  |  |  |  |  |  |
Exercised |  |  | (4 | ) |  |  |  |  |  |  |  |  |  |  |  |
Balance outstanding at June 30, 2019 |  |  | 2,617 |  |  | $ | 2.29 |  |  |  | 3.97 |  |  | $ | - |
Exercisable at June 30, 2019 |  |  | 2,383 |  |  | $ | 2.43 |  |  |  | 3.65 |  |  | $ | - |
Vested and expected to vest at June 30, 2019 |  |  | 2,594 |  |  | $ | 2.31 |  |  |  | 3.94 |  |  | $ | - |
Summary of activity for RSUs and PRSUs | A summary of activity for the Company's RSUs for the six months ended June 30, 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 |  |  | 4,148 |  |  |  | 0.85 |
Vested |  |  | (926 | ) |  |  | 1.08 |
Forfeited |  |  | (401 | ) |  |  | 0.96 |
Nonvested at June 30, 2019 |  |  | 5,391 |  |  | $ | 1.04 |
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 |  |  | Six Months Ended |
|  | June 30, 2019 |  |  | July 1, 2018 |  |  | June 30, 2019 |  |  | July 1, 2018 |
Expected term (months) |  |  | 6.00 |  |  |  | 6.0 |  |  |  | 6.00 |  |  |  | 6.00 |
Risk-free interest rate |  |  | 2.40 | % |  |  | 2.09 | % |  |  | 2.40 | % |  |  | 2.09 | %
Volatility |  |  | 53.77 | % |  |  | 44.76 | % |  |  | 53.77 | % |  |  | 44.76 | %
Dividend yield |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |

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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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