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Employee Stock Plans | 3 Months Ended
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Apr. 02, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Employee Stock Plans | Employee Stock Plans 2009 Stock Plan The 2009 Stock Plan, or 2009 Plan, was amended and restated by the Board of Directors in January 2015 and approved by the Company's stockholders on April 23, 2015 to, among other things, reserve an additional 2.5 million shares of common stock for issuance under the 2009 Plan. As of April 2, 2017, approximately 10.2 million shares were reserved for issuance under the 2009 Plan. On April 26, 2017, Company's stockholders among other things, approved to reserve an additional 1.5 million shares of common stock for issuance under the 2009 Plan. Equity awards granted under the 2009 Plan have a term of up to ten years. Options typically vest at a rate of 25% one year after the vesting commencement date, and one forty-eighth for each month of service thereafter. RSUs typically vest at a rate of 25% one year after the vesting commencement date, and one eighth every six months thereafter. The Company may implement different vesting schedules in the future with respect to any new equity awards. Employee Stock Purchase Plan The 2009 Employee Stock Purchase Plan, or 2009 ESPP, was adopted in March 2009. In January 2015, the 2009 ESPP was amended by the Board of Directors and approved by the Company's stockholders on April 23, 2015 to reserve an additional 1.0 million shares of common stock for issuance under the 2009 ESPP. As of April 2, 2017, approximately 3.3 million shares were reserved for issuance under the 2009 ESPP Plan. On April 26, 2017, Company's stockholders among other things, approved to reserve an additional 1.5 million shares of common stock for issuance under the 2009 ESPP Plan. The 2009 ESPP provides for six month offering periods. Participants purchase shares through payroll deductions of up to 20% of an employee's total compensation (maximum of 20,000 shares per offering period). The 2009 ESPP permits the Board of Directors to determine, prior to each offering period, whether participants purchase shares at: (i) 85% of the fair market value of the common stock at the end of the offering period; or (ii) 85% of the lower of the fair market value of the common stock at the beginning or the end of an offering period. The Board of Directors has determined that, until further notice, future offering periods will be made at 85% of the lower of the fair market value of the common stock at the beginning or the end of an offering period. Stock-Based Compensation The stock-based compensation expense included in the Company's consolidated financial statements for the three months ended April 2, 2017 and April 3, 2016 was as follows (in thousands):
| Three Months Ended
| April 2, 2017 |  | April 3, 2016
Cost of revenue | $ | 33 |  |  | $ | 38 |
Research and development | 139 |  |  | 291 |
Selling, general and administrative | 146 |  |  | 233 |
Total costs and expenses | $ | 318 |  |  | $ | 562 |
No stock-based compensation was capitalized during any period presented above. No stock options were granted in the first quarter of 2017 and 2016. As of April 2, 2017 and April 3, 2016, the fair value of unvested stock options, net of expected forfeitures, was approximately $413,000 and $656,000, respectively. This unrecognized stock-based compensation expense is expected to be recorded over a weighted average period of 2.91 years. Stock-Based Compensation Award Activity The following table summarizes the activity in the shares available for grant under the 2009 Plan during the three months ended April 2, 2017:
| Shares Available for Grant
| (in thousands)
Balance at January 1, 2017 | 2,632 |
Options forfeited or expired | 80 |
RSUs granted | (136 | )
RSUs forfeited or expired | 101 |
Balance at April 2, 2017 | 2,677 |
Stock Options The following table summarizes stock options outstanding and stock option activity under the 2009 Plan, and the related weighted average exercise price, for the first three months of 2017:
| Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Term |  | Aggregate Intrinsic Value
| (in thousands) |  |  |  | (in years) |  | (in thousands)
Balance outstanding at January 1, 2017 | 4,979 |  |  | $ | 2.35 |  |  |  |  |
Forfeited or expired | (80 | ) |  | $ | 3.01 |  |  |  |  |
Exercised | (53 | ) |  | 1.31 |  |  |  |  |
Balance outstanding at April 2, 2017 | 4,846 |  |  | $ | 2.35 |  |  | 3.88 |  | $ | 1,136 |
Exercisable at April 2, 2017 | 3,976 |  |  | $ | 2.61 |  |  | 2.74 |  | $ | 449 |
Vested and expected to vest at April 2, 2017 | 4,685 |  |  | $ | 2.39 |  |  | 3.70 |  | $ | 999 |
The aggregate intrinsic value in the table above represents the total pretax intrinsic value, based on the Company's closing stock price of $1.78 as of the end of the Company's current reporting period, which would have been received by the option holders had all option holders exercised their options as of that date. The total intrinsic value of options exercised during the first three months of 2017 and 2016 was $27,000 and $0, respectively. Total cash received from employees as a result of employee stock option exercises during the first three months of 2017 and 2016 was approximately $70,000 and $0 respectively. The Company settles employee stock option exercises with newly issued common shares. In connection with these exercises, there was no tax benefit realized by the Company due to the Company's current loss position. Total stock-based compensation related to stock options was $62,000 for the three months ended April 2, 2017. Restricted Stock Units and Performance-based Restricted Stock Units The Company began issuing RSUs and PRSUs in the third quarter of 2007. RSUs entitle the holder to receive, at no cost, one common share for each RSU as it vests. In general, the Company's policy is to withhold shares in settlement of employee tax withholding obligations upon the vesting of RSUs. The stock-based compensation related to RSUs and PRSUs was $156,000 and $0 for the three months ended April 2, 2017, respectively. As of April 2, 2017 and April, 3, 2016, there was $1.0 million and $1.7 million, respectively, in unrecognized compensation expense related to RSUs and PRSUs. A summary of activity for the Company's RSUs and PRSUs for the three months ended April 2, 2017 and information regarding RSUs and PRSUs outstanding and expected to vest as of April 2, 2017 is as follows:
| RSUs & PRSUs Outstanding
| Number of Shares |  | Weighted Average Grant Date Fair Value
| (in thousands) |  |
Nonvested at January 1, 2017 | 1,370 |  |  | $ | 1.68 |
Granted | 136 |  |  | 1.70 |
Vested | (52 | ) |  | 1.72 |
Forfeited | (101 | ) |  | — |
Nonvested at April 2, 2017 | 1,353 |  |  | $ | 1.68 |
Employee Stock Purchase Plan The weighted average estimated fair value, as defined by the amended authoritative guidance, of rights issued pursuant to the Company's 2009 ESPP during the first quarters of 2017 and 2016 was $0.23 and $0.38 per right, respectively. As of April 2, 2017, 687,000 shares remained available for issuance under the 2009 ESPP. For the three months ended April 2, 2017, the Company recorded stock-based compensation expense related to the 2009 ESPP of $67,000. 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
| April 2, 2017 |  | April 3, 2016
Expected term (months) | 6.00 |  |  | 6.00 |
Risk-free interest rate | 0.57 | % |  | 0.31 | %
Volatility | 48.69 | % |  | 57.16 | %
Dividend yield | — |  |  | — |
As of April 2, 2017, the unrecognized stock-based compensation expense relating to the Company's 2009 ESPP was $31,000 and is expected to be recognized over a weighted average period of approximately 1.4 months.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51659978&loc=d3e25284-112666 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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