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Stock-Based Compensation (Tables)

6 Months Ended

Jun. 29, 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								Six Months Ended
		June 29, 2018				June 30, 2017				June 29, 2018				June 30, 2017
Employee stock options		$	897			$	493			$	1,516			$	761
Restricted stock			59				46				110				86
Restricted stock units			494				329				1,092				531
Nonemployee stock options			148				—				181				—
Total		$	1,598			$	868			$	2,899			$	1,378

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								Six Months Ended
		June 29, 2018				June 30, 2017				June 29, 2018				June 30, 2017
Cost of sales		$	4			$	2			$	7			$	4
General and administrative			655				394				1,174				658
Marketing and selling			366				228				826				344
Research and development			573				244				892				372
Total stock-based compensation expense			1,598				868				2,899				1,378
Amounts capitalized as part of inventory			145				110				267				162
Total stock-based compensation		$	1,743			$	978			$	3,166			$	1,540

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								Six Months Ended
		June 29, 2018				June 30, 2017				June 29, 2018				June 30, 2017
Expected dividend yield			0	%			0	%			0	%			0	%
Expected volatility			53	%			57	%			53	%			57	%
Risk-free interest rate			2.81	%			1.81	%			2.70	%			1.95	%
Expected term (in years)			5.72				5.67				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 June 29, 2018 is presented below:

		Option Shares (000’s)
Outstanding at December 29, 2017			3,725
Granted			786
Exercised			(306	)
Forfeited or expired			(21	)
Outstanding at June 29, 2018			4,184
Exercisable at June 29, 2018			2,689

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 June 29, 2018 is presented below:

		Restricted Shares (000’s)				Restricted Units (000’s)
Outstanding at December 29, 2017			21				488
Granted			11				47
Vested			(21	)			(177	)
Forfeited or expired			—				(4	)
Outstanding at June 29, 2018			11				354

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Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.

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