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Stockholders' Equity (Tables)

12 Months Ended

Jan. 02, 2015

Schedule of Employee Service Share-based Compensation [Line Items]

Schedule Of Compensation Cost [Table Text Block]

The cost that has been charged against income for stock-based compensation is set forth below (in thousands):

		Fiscal Year Ended
		January 2, 2015			January 3, 2014			December 28, 2012
Employee stock options		$	2,842		$	2,683		$	2,595
Restricted stock			935			999			590
Restricted stock units			795			589			—
Consultant compensation			91			218			23
Total		$	4,663		$	4,489		$	3,208

Schedule of Share-based Compensation, Activity [Table Text Block]

The Company recorded stock-based compensation expense in the following categories on the accompanying condensed consolidated statements of operations (in thousands):

		Fiscal Year Ended
		January 2, 2015			January 3, 2014			December 28, 2012
General and administrative		$	2,660		$	2,663		$	2,231
Marketing and selling			1,065			1,167			545
Research and development			938			659			432
Total		$	4,663		$	4,489		$	3,208

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

		Fiscal Year Ended
		January 2, 2015		January 3, 2014		December 28, 2012
Expected dividend yield		0	%	0	%	0	%
Expected volatility		55	%	71	%	79	%
Risk-free interest rate		1.29	%	0.73	%	0.82	%
Expected term (in years)		4.12		4.12		5.21

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

A summary of option activity under the Plan for the year ended January 2, 2015 is presented below:

Options		Shares (000’s)		Weighted- Average Exercise Price				Weighted- Average Remaining Contractual Term (years)		Aggregate Intrinsic Value (000’s)
Outstanding at January 3, 2014		3,299		$	6.17
Granted		617			15.43
Exercised		(584)			6.09
Forfeited or expired		(157)			11.92
Outstanding at January 2, 2015		3,175		$	7.79			6.19		$	8,692
Exercisable at January 2, 2015		2,085		$	5.71			4.91		$	7,583

Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block]

                The fair value of the warrants was estimated on the issuance date, June 1, 2009, using a Black-Scholes option valuation model applying the assumptions noted in the following table:

		As of June 1, 2009
Common stock price per share		$	1.01
Number of warrants			700,000
Expected dividends			0	%
Expected volatility			74.4	%
Risk-free rate			3.28	%
Life (in years)			6.0

Schedule Of Warrant Activity [Table Text Block]

A summary of the warrant activity for the year ended January 2, 2015 is provided below:

		Shares (000’s)		Weighted- Average Exercise Price			Weighted- Average Remaining Contractual Term (years)		Aggregate Intrinsic Value (000’s)
Outstanding at January 3, 2014		700		$	4.00
Granted		—			—
Exercised		—			—
Forfeited or expired		—			—
Outstanding at January 2, 2015		700		$	4.00		0.41		$	3,521
Exercisable at January 2, 2015		700		$	4.00		0.41		$	3,521

Restricted Stock [Member]

Schedule of Employee Service Share-based Compensation [Line Items]

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

Restricted stock

A summary of restricted stock activity for the year ended January 2, 2015 is presented below:

		Shares (000’s)		Weighted Average Grant-Date Fair Value per Share
Outstanding at January 3, 2014		341		$	7.55
Granted		65			13.89
Vested		(140)			6.92
Forfeited or expired		(19)			9.91
Outstanding at January 2, 2015		247		$	9.41

Restricted Stock Units (RSUs) [Member]

Schedule of Employee Service Share-based Compensation [Line Items]

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

Restricted Stock Units

A summary of restricted stock units activity for the year ended January 2, 2015 is presented below:

		Units (000’s)		Weighted Average Grant-Date Fair Value per Share
Outstanding at January 3, 2014		135		$	5.34
Granted		314			15.34
Vested		(135)			5.34
Forfeited or expired		(158)			15.54
Outstanding at January 2, 2015		156		$	15.14

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