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Stock-Based Compensation (Tables)

6 Months Ended

Jun. 28, 2015

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 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

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 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	—			—			—			—

Schedule of share-based compensation, 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

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 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

Schedule of share-based compensation, restricted stock and restricted stock units activity

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

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 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	—			—						—

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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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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 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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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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