Employee Stock Plans	6 Months Ended
Jun. 28, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Employee stock plans	Employee Stock Plans 1999 Stock Plan The 1999 Stock Plan, or 1999 Plan, provided for the issuance of incentive and non-qualified options, restricted stock units (" RSUs") and restricted stock. Equity awards granted under the 1999 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. In March 2009, the Board adopted the 2009 Stock Plan, which was approved by the Company's stockholders on April 22, 2009. Effective April 22, 2009, no further stock options may be granted under the 1999 Plan. 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 June 28, 2015, approximately 9.6 million shares were reserved for issuance under the 2009 Plan. Equity awards that are cancelled, forfeited or repurchased under the 1999 Plan become available for grant under the 2009 Plan, up to a maximum of an additional 10 million shares. 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 June 28, 2015 approximately 3.3 million shares were reserved 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.

Employee Stock Plans

1999 Stock Plan

The 1999 Stock Plan, or 1999 Plan, provided for the issuance of incentive and non-qualified options, restricted stock units (" RSUs") and restricted stock. Equity awards granted under the 1999 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. In March 2009, the Board adopted the 2009 Stock Plan, which was approved by the Company's stockholders on April 22, 2009. Effective April 22, 2009, no further stock options may be granted under the 1999 Plan.

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 June 28, 2015, approximately 9.6 million shares were reserved for issuance under the 2009 Plan. Equity awards that are cancelled, forfeited or repurchased under the 1999 Plan become available for grant under the 2009 Plan, up to a maximum of an additional 10 million shares. 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 June 28, 2015 approximately 3.3 million shares were reserved 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.