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Stock-Based Compensation (Tables)

3 Months Ended

Mar. 30, 2018

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
	March 30, 2018		March 31, 2017
Employee stock options	$	619	$	268
Restricted stock		51		40
Restricted stock units		598		202
Nonemployee stock options		33		—
Total	$	1,301	$	510

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
	March 30, 2018		March 31, 2017
Cost of sales	$	3	$	2
General and administrative		519		264
Marketing and selling		460		116
Research and development		319		128
Total stock-based compensation expense		1,301		510
Amounts capitalized as part of inventory		122		52
Total stock-based compensation	$	1,423	$	562

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
	March 30, 2018			March 31, 2017
Expected dividend yield		0	%		0	%
Expected volatility		53	%		57	%
Risk-free interest rate		2.61	%		1.96	%
Expected term (in years)		5.72			5.67

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

A summary of option activity under the Plan for the quarter ended March 30, 2018 is presented below:

	Option Shares (000’s)
Outstanding at December 29, 2017		3,725
Granted		412
Exercised		(56)
Forfeited or expired		(11)
Outstanding at March 30, 2018		4,070
Exercisable at March 30, 2018		2,793

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

A summary of restricted stock and RSU activity under the Plan for the quarter ended March 30, 2018 is presented below:

	Restricted Shares (000’s)		Restricted Units (000’s)
Outstanding at December 29, 2017		21		488
Granted		—		47
Vested		—		(152)
Forfeited or expired		—		(3)
Outstanding at March 30, 2018		21		380