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Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

The stock-based compensation expense included in the Company's consolidated financial statements for the second quarter of 2013 and 2012 was as follows (in thousands):

	Three Months Ended								Six Months Ended
	June 30, 2013				July 1, 2012				June 30, 2013				July 1, 2012
Cost of revenue	$	22			$	39			$	52			$	71
Research and development	46				99				212				192
Selling, general and administrative	217				296				473				555
Total costs and expenses	$	285			$	434			$	737			$	818

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The following weighted average assumptions are included in the estimated fair value calculations for stock option grants:

	Three Months Ended						Six Months Ended
	June 30, 2013			July 1, 2012			June 30, 2013			July 1, 2012
Expected term (years)	6.42			6.53			6.13			6.22
Risk-free interest rate	1.27	%		1.16	%		1.18	%		1.10	%
Expected volatility	59.31	%		59.03	%		60.44	%		59.65	%
Expected dividend yield	—			—			—			—

Schedule of Share-based Compensation, Activity

The following table summarizes the shares available for grant under the 2009 Plan as of June 30, 2013:

	Shares Available for Grant
	(in thousands)
Balance at December 30, 2012	2,920
Authorized	—
Options granted	(99	)
Options forfeited or expired	200
RSUs granted	(18	)
PRSUs forfeited or expired	25
Balance at June 30, 2013	3,028

Schedule of Share-based Compensation, Stock Options, Activity

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 2013:

	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, 2012	6,960			$	2.55
Granted	99			2.32
Forfeited or expired	(200	)		2.27
Exercised	(34	)		1.40
Balance outstanding at June 30, 2013	6,825			$	2.56			5.80			$	1,533
Exercisable at June 30, 2013	5,395			$	2.54			5.11			$	1,527
Vested and expected to vest at June 30, 2013	6,583			$	2.56			5.70			$	1,532

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity

A summary of activity for our RSUs and PRSUs for the six months ended June 30, 2013 and information regarding RSUs and PRSUs outstanding and expected to vest as of June 30, 2013 is as follows:

	RSUs & PRSUs Outstanding
	Number of Shares			Weighted Average Grant Date Fair Value
	(in thousands)
Nonvested at December 30, 2012	40			$	2.30
Granted	19			2.30
Vested	(17	)		2.33
Forfeited	(25	)		—
Nonvested at June 30, 2013	17			$	2.29

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumption

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, 2013			July 1, 2012			June 30, 2013			July 1, 2012
Expected term (months)	6.08			6.08			6.08			6.08
Risk-free interest rate	0.09	%		0.14	%		0.09	%		0.14	%
Volatility	39.03	%		67.93	%		39.03	%		67.93	%
Dividend yield	—			—			—			—

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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.

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Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value.

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Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

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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.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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