Stock-Based Compensation (Tables)

3 Months Ended

Apr. 03, 2016

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

Schedule of stock based compensation expense

The stock-based compensation expense included in the Company's consolidated financial statements for the three months ended April 3, 2016 and March 29, 2015 was as follows (in thousands):

	Three Months Ended
	April 3, 2016		March 29, 2015
Cost of revenue	$	38	$	39
Research and development	291		191
Selling, general and administrative	233		267
Total costs and expenses	$	562	$	497

 No stock-based compensation was capitalized during any period presented above.

Schedule of weighted average assumptions included in the estimated fair value calculations for stock option grants

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

	Three Months Ended
	April 3, 2016		March 29, 2015
Expected term (years)	0		4.78
Risk-free interest rate	—	%	1.40	%
Expected volatility	—	%	52.11	%
Expected dividend yield	—		—

Summary of the activity in the shares available for grant under the 2009 plan

The following table summarizes the activity in the shares available for grant under the 2009 Plan during the three months ended April 3, 2016:

	Shares Available for Grant
	(in thousands)
Balance at January 03, 2016	2,929
Options forfeited or expired	209
RSUs granted	(260	)
PRSUs granted	(52	)
RSUs forfeited or expired	68
Balance at April 3, 2016	2,894

Summary of stock options outstanding and stock option activity under the 1999 plan and the 2009 plan, and the related weighted average exercise price

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 three months of 2016:

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Term	Aggregate Intrinsic Value
	(in thousands)				(in years)	(in thousands)
Balance outstanding at January 3, 2016	5,266		$	2.64
Forfeited or expired	(209	)	$	2.33
Balance outstanding at April 3, 2016	5,057		$	2.66	4.29	$	66
Exercisable at April 3, 2016	4,522		$	2.63	3.83	$	66
Vested and expected to vest at April 3, 2016	4,968		$	2.65	4.21	$	66

Summary of activity for RSUs and PRSUs

A summary of activity for the Company's RSUs and PRSUs for the three months ended April 3, 2016 and information regarding RSUs and PRSUs outstanding and expected to vest as of April 3, 2016 is as follows:

	RSUs & PRSUs Outstanding
	Number of Shares		Weighted Average Grant Date Fair Value
	(in thousands)
Nonvested at January 3, 2016	1,435		$	2.30
Granted	312		1.26
Vested	(136	)	1.26
Forfeited	(68	)	—
Nonvested at April 3, 2016	1,543		$	2.19

Summary of the fair value of rights issued pursuant to ESPP

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
	April 3, 2016		March 29, 2015
Expected term (months)	6.00		5.96
Risk-free interest rate	0.31	%	0.08	%
Volatility	57.16	%	49.57	%
Dividend yield	—		—