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Stock-Based Compensation | 6 Months Ended
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Jun. 28, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-based compensation | Stock-Based Compensation The Company's equity incentive program is a broad-based, long-term retention program intended to attract, motivate, and retain talented employees as well as align stockholder and employee interests. The Company provides stock-based incentive compensation, or awards, to eligible employees and non-employee directors. Awards that may be granted under the program include non-qualified and incentive stock options, restricted stock units, or RSUs, performance-based restricted stock units, or PRSUs, and cash settlement of stock appreciation rights, or SARs. To date, awards granted under the program consist of stock options, RSUs and PRSUs. The majority of stock-based awards granted under the program vest over four years. Stock options granted under the program have a maximum contractual term of ten years. The stock-based compensation expense included in the Company's consolidated financial statements for the three and six months ended June 28, 2015 and June 29, 2014 was as follows (in thousands):
| Three Months Ended |  | Six Months Ended
| June 28, 2015 |  | June 29, 2014 |  | June 28, 2015 |  | June 29, 2014
Cost of revenue | $ | 27 |  |  | $ | 36 |  |  | $ | 66 |  |  | $ | 78 |
Research and development | 212 |  |  | 221 |  |  | 403 |  |  | 574 |
Selling, general and administrative | 252 |  |  | 309 |  |  | 519 |  |  | 646 |
Total costs and expenses | $ | 491 |  |  | $ | 566 |  |  | $ | 988 |  |  | $ | 1,298 |
No stock-based compensation was capitalized during any period presented above. Valuation Assumptions The Company uses the Black-Scholes option pricing model to estimate the fair value of employee stock options and rights to purchase shares under the Company's 2009 ESPP. Using the Black-Scholes pricing model requires the Company to develop highly subjective assumptions including the expected term of awards, expected volatility of its stock, expected risk-free interest rate and expected dividend rate over the term of the award. The Company's expected term of awards assumption is based primarily on its historical experience with similar grants. The Company's expected stock price volatility assumption for both stock options and ESPP shares is based on the historical volatility of the Company's stock, using the daily average of the opening and closing prices and measured using historical data appropriate for the expected term. The risk-free interest rate assumption approximates the risk-free interest rate of a Treasury Constant Maturity bond with a maturity approximately equal to the expected term of the stock option or ESPP shares. This fair value is expensed over the requisite service period of the award. The fair value of RSUs and PRSUs is based on the closing price of the Company's common stock on the date of grant. Equity compensation awards which vest with service are expensed using the straight-line attribution method over the requisite service period. In addition to the assumptions used in the Black-Scholes pricing model, the amended authoritative guidance requires that the Company recognize expense for awards ultimately expected to vest; therefore the Company is required to develop an estimate of the number of awards expected to be forfeited prior to vesting, or forfeiture rate. The forfeiture rate is estimated based on historical pre-vest cancellation experience and is applied to all share-based awards. The following weighted average assumptions are included in the estimated fair value calculations for stock option grants:
| Three Months Ended |  | Six Months Ended
| June 28, 2015 |  | June 29, 2014 |  | June 28, 2015 |  | June 29, 2014
Expected term (years) | — |  |  | 6.00 |  |  | 4.78 |  |  | 6.19 |
Risk-free interest rate | — | % |  | 1.90 | % |  | 1.40 | % |  | 1.98 | %
Expected volatility | — | % |  | 55.70 | % |  | 52.11 | % |  | 55.10 | %
Expected dividend yield | — |  |  | — |  |  | — |  |  | — |
No stock options were granted in the second quarter of 2015. The weighted average estimated fair value for options granted during the second quarter of 2014 was $1.86 per option. The weighted average estimated fair value for options granted during the six months of 2015 and 2014 was $0.90 and $2.10, per option, respectively. As of June 28, 2015 and June 29, 2014, the fair value of unvested stock options, net of expected forfeitures, was approximately $2.7 million and $2.1 million, respectively. This unrecognized stock-based compensation expense is expected to be recorded over a weighted average period of 2.26 years. Stock-Based Compensation Award Activity The following table summarizes the activity in the shares available for grant under the 2009 Plan during the six months ended June 28, 2015:
| Shares Available for Grant
| (in thousands)
Balance at December 28, 2014 | 1,139 |
Authorized | 2,500 |
Options granted | (80 | )
Options forfeited or expired | 174 |
RSUs granted | (298 | )
PRSUs granted | (20 | )
RSUs forfeited or expired | 35 |
Balance at June 28, 2015 | 3,450 |
Stock Options The following table summarizes stock options outstanding and stock option activity under the 1999 Plan and the 2009 Plan, and the related weighted average exercise price, for the first six months of 2015:
| Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Term |  | Aggregate Intrinsic Value
| (in thousands) |  |  |  | (in years) |  | (in thousands)
Balance outstanding at December 28, 2014 | 5,682 |  |  | $ | 2.67 |  |  |  |  |
Granted | 80 |  |  | 2.00 |  |  |  |  |
Forfeited or expired | (174 | ) |  | 3.41 |  |  |  |  |
Exercised | (117 | ) |  | 0.98 |  |  |  |  |
Balance outstanding at June 28, 2015 | 5,471 |  |  | $ | 2.67 |  |  | 4.84 |  | $ | 292 |
Exercisable at June 28, 2015 | 4,631 |  |  | $ | 2.61 |  |  | 4.20 |  | $ | 292 |
Vested and expected to vest at June 28, 2015 | 5,317 |  |  | $ | 2.66 |  |  | 4.72 |  | $ | 292 |
The aggregate intrinsic value in the table above represents the total pretax intrinsic value, based on the Company's closing stock price of $1.61 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 six months of 2015 and 2014 was $81,000 and $3.6 million, respectively. Total cash received from employees as a result of employee stock option exercises during the first six months of 2015 and 2014 was approximately $114,000 and $4.2 million 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 $211,000 and $459,000 for the three months and six months ended June 28, 2015. 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 $188,000 and $20,000, for the three months and $343,000 and $35,000 for the six months ended June 28, 2015, respectively. As of June 28, 2015, there was $1.7 million in unrecognized compensation expense related to RSUs and PRSUs. A summary of activity for the Company's RSUs and PRSUs for the six months ended June 28, 2015 and information regarding RSUs and PRSUs outstanding and expected to vest as of June 28, 2015 is as follows:
| RSUs & PRSUs Outstanding
| Number of Shares |  | Weighted Average Grant Date Fair Value
| (in thousands) |  |
Nonvested at December 28, 2014 | 650 |  |  | $ | 3.47 |
Granted | 318 |  |  | 1.85 |
Vested | (54 | ) |  | 2.04 |
Forfeited | (35 | ) |  | — |
Nonvested at June 28, 2015 | 879 |  |  | $ | 3.10 |
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 second quarters of 2015 and 2014 was $0.48 and $1.01 per right, respectively. As of June 28, 2015, 1,634,000 shares remained available for issuance under the 2009 ESPP including 1.0 million additional shares authorized in the second quarter. For the second quarter and first six months ended June 28, 2015, the Company recorded stock-based compensation expense related to the 2009 ESPP of $72,000 and $151,000, respectively. 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 28, 2015 |  | June 29, 2014 |  | June 28, 2015 |  | June 29, 2014
Expected term (months) | 6.08 |  |  | 6.09 |  |  | 6.08 |  |  | 6.09 |
Risk-free interest rate | 0.08 | % |  | 0.05 | % |  | 0.08 | % |  | 0.05 | %
Volatility | 51.54 | % |  | 49.17 | % |  | 51.54 | % |  | 49.17 | %
Dividend yield | — |  |  | — |  |  |  |  | — |
As of June 28, 2015, the unrecognized stock-based compensation expense relating to the Company's 2009 ESPP was $121,000 and is expected to be recognized over a weighted average period of approximately 4.5 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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