Stockholders' Equity (Tables)

12 Months Ended

Dec. 29, 2012

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

Schedule of Stock-Based Compensation Expense

Total stock-based compensation expense included in our Condensed Consolidated Statements of Operations and Comprehensive (Loss) Income was as follows (in thousands):

	Year Ended
	December 29, 2012		December 31, 2011		January 1, 2011
Line item:
Cost of products sold	$	525	$	461	$	312
Research and development	3,009		2,697		1,851
Selling, general and administrative	3,976		3,095		2,388
Restructuring charges	—		103		—
Total stock-based compensation	$	7,510	$	6,356	$	4,551

Schedule of Share-based Payment Award, Stock Options and Employee Stock Purchase Plan, Valuation Assumptions

	Year Ended
	December 29, 2012	December 31, 2011	January 1, 2011
Employee and Director Stock Options
Expected volatility (%)	58.1 to 59.5	57.4 to 61.9	55.1 to 61.6
Risk-free interest rate (%)	.006 to .01	.003 to .02	.78 to 2.47
Expected term (in years)	4.09 to 4.47	4.05 to 4.37	4.06 to 4.43
Dividend yield	—%	—%	—%
Employee Stock Purchase Plan
Weighted average expected volatility (%)	50.0	48.1	52.3
Weighted average risk-free interest rate (%)	0.12	0.14	0.20
Expected term (in years)	0.50	0.50	0.50
Dividend yield	—%	—%	—%

Schedule of Share-based Compensation, Stock Options, Activity

The following table summarizes our stock option activity and related information for the year ended December 29, 2012 (shares and aggregate intrinsic value in thousands):

	Shares		Weighted average exercise price		Weighted average remaining contractual term (years)	Aggregate Intrinsic Value
Balance, December 31, 2011	9,287		$	4.22
Granted	3,237		5.96
Exercised	(1,342	)	2.56
Forfeited or expired	(1,643	)	5.95
Balance, December 29, 2012	9,539		$	4.74
Vested and expected to vest at December 29, 2012	9,539		$	4.74	4.53	$	4,462
Exercisable, December 29, 2012	5,013		$	4.20	3.46	$	3,517

Schedule of Nonvested Restricted Stock Units Activity

The following table summarizes our RSU activity for the year ended December 29, 2012 (shares in thousands):

	Shares		Weighted average grant date fair value
Balance at December 31, 2011	1,077		$	6.12
Granted	643		5.99
Vested	(514	)	5.93
Forfeited	(127	)	5.95
Balance at December 29, 2012	1,079		$	6.15