STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2017

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

Schedule of impact on results of operations of recording stock-based compensation expense

The impact on the Company's results of operations of recording stock-based compensation expense for fiscal years 2017, 2016, and 2015 was as follows (in thousands):

	Fiscal Years
	2017		2016		2015
Cost of revenue	$	121	$	132	$	109
Research and development	614		658		826
Selling, general and administrative	706		794		1,064
Restructuring costs (1)	—		—		29
Total costs and expenses	$	1,441	$	1,584	$	2,028

⁽¹⁾ Stock-based compensation related to restructuring plan initiated in the second quarter of fiscal year 2015.

Schedule of shares available for grant

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

	Shares Available for Grant
	(in thousands)
Balance at January 1, 2017	2,632
Authorized	1,500
Options granted	—
Options forfeited or expired	1,356
RSUs granted	(1,852	)
RSUs forfeited	263
Balance at December 31, 2017	3,899

Schedule of stock options outstanding and stock option activity and related weighted average exercise price

The following table summarizes stock options outstanding and stock option activity under the 2009 Plan, and the related weighted average exercise price, for 2017, 2016 and 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	225		1.64
Forfeited or expired	(521	)	2.87
Exercised	(120	)	0.98
Balance outstanding at January 3, 2016	5,266		2.64		4.56
Granted	842		0.86
Forfeited or expired	(1,129	)	2.61
Exercised	—		—
Balance outstanding at January 1, 2017	4,979		2.35		4.06
Granted	—		—
Forfeited or expired	(1,356	)	3.07
Exercised	(65	)	1.31
Balance outstanding at December 31, 2017	3,558		$	2.09	4.34	$	976
Exercisable at December 31, 2017	3,001		$	2.29	3.56	$	524
Vested and expected to vest at December 31, 2017	3,443		$	2.13	4.20	$	879

Schedule of significant price ranges of options outstanding, related weighted average exercise prices and contractual life information

Significant exercise price ranges of options outstanding, related weighted average exercise prices and contractual life information at the end of 2017 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	4	1.17	$	0.78	4	$	0.78
$0.86	726	8.68	0.86		227	0.86
$0.90 - $1.32	359	2.11	0.98		327	0.94
$1.63	545	1.27	1.63		545	1.63
$2.17 - $2.65	307	4.42	2.25		307	2.25
$2.78	958	2.94	2.78		958	2.78
$2.82 - $3.36	231	5.30	3.15		211	3.15
$3.39	243	5.95	3.39		243	3.39
$3.48	120	3.85	3.48		120	3.48
$3.82	65	6.08	3.82		59	3.82
$0.78 - $3.82	3,558	4.34	$	2.09	3,001	$	2.29

Schedule of weighted average assumptions included in 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:

	Fiscal Years
	2017	2016		2015
Expected term (years)	NA	7.1		6.3
Risk-free interest rate	NA	1.40	%	1.75	%
Expected volatility	NA	52	%	56	%
Expected dividend	NA	—		—

Schedule of share-based compensation related to RSU

Stock-based compensation related to grants of vested RSUs was $1.0 million, $953,000, $834,000 in 2017, 2016 and 2015, respectively.

The following table summarizes RSU's activity under the 2009 Plan, and the related weighted average grant date fair value, for 2017, 2016 and 2015:

	RSUs & PRSUs Outstanding
	Number of Shares		Weighted Average Grant Date Fair Value
	(in thousands)
Nonvested at December 28, 2014	650		$	3.47
Granted	1,128		1.46
Vested	(221	)	1.42
Forfeited	(122	)	—
Nonvested at January 3, 2016	1,435		2.30
Granted	1,822		0.97
Vested	(649	)	1.07
Forfeited	(1,238	)	—
Nonvested at January 1, 2017	1,370		1.68
Granted	1,852		1.41
Vested	(596	)	1.46
Forfeited	(263	)	—
Nonvested at December 31, 2017	2,363		$	1.54

Schedule of weighted average assumptions

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
	2017		2016		2015
Expected life (months)	6.1		6.1		6.0
Risk-free interest rate	1.22	%	0.97	%	0.21	%
Volatility	53	%	59	%	55	%
Dividend yield	—		—		—