Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2016

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

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):

	Three Months Ended				Nine Months Ended
	September 30, 2016		October 2, 2015		September 30, 2016		October 2, 2015
Employee stock options	$	208	$	625	$	5,257	$	1,818
Restricted stock		32		88		259		396
Restricted stock units		146		210		2,569		484
Nonemployee stock options		—		—		58		49
Total	$	386	$	923	$	8,143	$	2,747

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

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

	Three Months Ended				Nine Months Ended
	September 30, 2016		October 2, 2015		September 30, 2016		October 2, 2015
Cost of sales	$	—	$	9	$	560	$	33
General and administrative		248		543		3,936		1,667
Marketing and selling		72		184		1,544		539
Research and development		66		187		2,103		508
Total stock compensation expense		386		923		8,143		2,747
Amounts capitalized as part of inventory		39		130		227		258
Total	$	425	$	1,053	$	8,370	$	3,005

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

The risk-free rate is based on the U.S. Treasury yield curve corresponding to the expected term at the time of the grant.

	Three Months Ended						Nine Months Ended
	September 30, 2016			October 2, 2015			September 30, 2016			October 2, 2015
Expected dividend yield		0	%		0	%		0	%		0	%
Expected volatility		57	%		58	%		57	%		57	%
Risk-free interest rate		1.19	%		1.60	%		1.34	%		1.61	%
Expected term (in years)		5.57			5.62			5.57			5.61

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

A summary of option activity under the Plan for the nine-month period ended September 30, 2016 is presented below:

	Options Shares (000’s)
Outstanding at January 1, 2016		3,623
Granted		761
Exercised		(424)
Forfeited or expired		(346)
Outstanding at September 30, 2016		3,614
Exercisable at September 30, 2016		2,968

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

A summary of restricted stock and restricted stock unit’s activity under the Plan for the nine-month period ended September 30, 2016 is presented below:

	Restricted Shares (000’s)		Restricted Units (000’s)
Outstanding at January 1, 2016		124		339
Granted		23		313
Exercised		(124)		(380)
Forfeited		—		(6)
Outstanding at September 30, 2016		23		266