Stock-Based Compensation (Tables)

12 Months Ended

Dec. 28, 2014

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

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

The impact on the Company's results of operations of recording stock-based compensation expense for fiscal years 2014, 2013, and 2012 was as follows (in thousands):

	Fiscal Years
	2014		2013		2012
Cost of revenue	$	137	$	232	$	179
Research and development	924		666		455
Selling, general and administrative	1,181		1,081		1,369
Total costs and expenses	$	2,242	$	1,979	$	2,003

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:

	Fiscal Years
	2014		2013		2012
Expected term (years)	6.6		6.1		6.3
Risk-free interest rate	1.98	%	1.74	%	0.98	%
Expected volatility	58	%	59	%	61	%
Expected dividend	—		—		—

Schedule of Share-based Compensation, Activity

The following table summarizes the shares available for grant under the 2009 Plan for 2014:

	Shares Available for Grant
	(in thousands)
Balance at December 29, 2013	2,253
Options granted	(428	)
Options forfeited or expired	219
RSUs granted	(927	)
PRSU's granted	(20	)
PRSU's forfeited or expired	42
Balance at December 28, 2014	1,139

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 2014, 2013 and 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	791		2.43
Forfeited or expired	(935	)	3.04
Exercised	(379	)	1.87
Balance outstanding at December 30, 2012	6,960		2.55
Granted	716		3.26
Forfeited or expired	(269	)	2.65
Exercised	(165	)	2.21
Balance outstanding at December 29, 2013	7,242		2.62
Granted	428		3.51
Forfeited or expired	(219	)	3.56
Exercised	(1,769	)	2.57
Balance outstanding at December 28 ,2014	5,682		$	2.67	5.47	$	3,889
Exercisable at December 28, 2014	4,554		$	2.56	4.69	$	3,616
Vested and expected to vest at December 28, 2014	5,456		$	2.65	5.33	$	3,852

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range

Significant exercise price ranges of options outstanding, related weighted average exercise prices and contractual life information at the end of 2014 were as follows:

	Options Outstanding				Options Exercisable
Range of Exercise Prices	Options Outstanding	Weighted Average Remaining Contractual Life	Weighted Average Exercise Price		Options Vested and Exercisable	Weighted Average Exercise Price
	(in thousands)	(in years)			(in thousands)
$0.78 - $0.90	516	3.82	$	0.90	516	$	0.90
1.63 - 1.63	895	4.19	1.63		895	1.63
2.16 - 2.76	571	6.96	2.29		349	2.31
2.78 - 2.78	1,596	5.89	2.78		1,454	2.78
2.82 - 3.20	633	5.19	3.03		399	2.94
3.21 - 3.48	727	7.94	3.40		325	3.41
3.54 - 3.92	167	8.70	3.69		39	3.64
4.17 - 4.17	504	2.86	4.17		504	4.17
4.36- 4.36	35	0.42	4.36		35	4.36
5.94 - 5.94	38	1.14	5.94		38	5.94
$0.78 - $5.94	5,682	5.47	$	2.67	4,554	$	2.56

Schedule of Share-based compensation related to RSU

The stock-based compensation related to grants of vested RSUs was $854,000 in 2014. In 2014, the Company also granted PRSUs, to new employees and the stock-based compensation related to PRSUs was $64,000.

	RSUs & PRSUs Outstanding
	Number of Shares		Weighted Average Grant Date Fair Value
	(in thousands)
Nonvested at December 29, 2013	225		$	3.17
Granted	947		3.74
Vested	(480	)	3.86
Forfeited	(42	)	—
Nonvested at December 28, 2014	650		$	3.47

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:

	Fiscal Years
	2014		2013		2012
Expected life (months)	6.0		6.1		6.00
Risk-free interest rate	0.07	%	0.09	%	0.14	%
Volatility	49	%	39	%	56	%
Dividend yield	—		—		—