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Stockholders' Equity (Tables)

9 Months Ended

Sep. 27, 2019

Stockholders Equity Note [Abstract]

Schedule of Compensation Cost

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 27, 2019				September 28, 2018				September 27, 2019				September 28, 2018
Employee stock options		$	2,178			$	1,197			$	5,770			$	2,713
Restricted stock			77				82				236				192
Restricted stock units			246				501				1,661				1,593
Nonemployee stock options			57				247				111				428
Total stock-based compensation expense		$	2,558			$	2,027			$	7,778			$	4,926

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

The Company recorded stock-based compensation costs in the following categories (in thousands):

		Three Months Ended								Nine Months Ended
		September 27, 2019				September 28, 2018				September 27, 2019				September 28, 2018
Cost of sales		$	7			$	4			$	43			$	11
General and administrative			1,082				701				2,878				1,875
Marketing and selling			692				471				2,553				1,297
Research and development			777				851				2,304				1,743
Total stock-based compensation expense, net			2,558				2,027				7,778				4,926
Amounts capitalized as part of inventory			258				182				723				449
Total stock-based compensation expense, gross		$	2,816			$	2,209			$	8,501			$	5,375

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

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 27, 2019				September 28, 2018				September 27, 2019				September 28, 2018
Expected dividend yield			0	%			0	%			0	%			0	%
Expected volatility			53	%			53	%			53	%			53	%
Risk-free interest rate			1.55	%			2.84	%			2.40	%			2.71	%
Expected term (in years)			5.67				5.72				5.67				5.72

Schedule of Share-based Compensation, Stock Options, Activity

A summary of stock option activity under the Plan for the nine months ended September 27, 2019 is presented below:

		Stock Options (in 000’s)				Minimum Exercise Price				Maximum Exercise Price
Outstanding at December 28, 2018			3,920
Granted			818
Exercised			(190	)
Forfeited or expired			(23	)
Outstanding at September 27, 2019			4,525			$	3.50			$	43.84
Exercisable at September 27, 2019			3,104

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity

A summary of restricted stock and RSU activity under the Plan for the nine months ended September 27, 2019 is presented below:

		Restricted Stock (in 000’s)				Restricted Stock Units (in 000’s)
Unvested at December 28, 2018			11				322
Granted			11				19
Vested			(11	)			(210	)
Forfeited or expired			—				(6	)
Unvested at September 27, 2019			11				125

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