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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2012

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

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

The impact of the amended authoritative guidance on the Company's consolidated financial statements for the third quarter of 2012 and 2011 was as follows (in thousands):

	Three Months Ended								Nine Months Ended
	September 30, 2012				October 2, 2011				September 30, 2012				October 2, 2011
Cost of revenue	$	69			$	34			$	140			$	104
Research and development	147				114				339				354
Selling, general and administrative	385				264				940				833
Total costs and expenses	$	601			$	412			$	1,419			$	1,291

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						Nine Months Ended
	September 30, 2012			October 2, 2011			September 30, 2012			October 2, 2011
Expected term (years)	4.92			4.93			5.58			4.93
Risk-free interest rate	0.67	%		1.15	%		0.89	%		1.50	%
Expected volatility	65.56	%		60.93	%		62.59	%		59.96	%
Expected dividend yield	—			—			—			—

Schedule of Share-based Compensation, Activity

The following table summarizes the shares available for grant under the 2009 Plan as of September 30, 2012:

	Shares Available for Grant
	(in thousands)
Balance at January 1, 2012	2,969
Authorized	—
Options granted	(429	)
Options forfeited or expired	493
RSUs granted	(2	)
RSUs forfeited or expired	—
Balance at September 30, 2012	3,031

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 nine months of 2012:

	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, 2012	7,483			$	2.58
Granted	345			2.76
Forfeited or expired	(493	)		3.60
Exercised	(353	)		1.87
Balance outstanding at September 30, 2012	6,982			$	2.56			6.00			$	3,114
Exercisable at September 30, 2012	5,017			$	2.53			5.06			$	2,683
Vested and expected to vest at September 30, 2012	6,669			$	2.55			5.88			$	3,065

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

	RSUs Outstanding
	Number of Shares			Weighted Average Grant Date Fair Value
	(in thousands)
Nonvested at January 1, 2012	—			$	—
Granted	86			2.19
Vested	(86	)		2.19
Forfeited	—			—
Nonvested at September 30, 2012	—			$	—

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

The fair value of rights issued pursuant to the Company's ESPP was estimated on the commencement date of each offering period using the following weighted average assumptions:

	Three Months Ended						Nine Months Ended
	September 30, 2012			October 2, 2011			September 30, 2012			October 2, 2011
Expected term (months)	6.08			6.00			6.08			6.00
Risk-free interest rate	0.14	%		0.10	%		0.14	%		0.10	%
Volatility	67.93	%		47.00	%		67.93	%		47.00	%
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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