Stockholders' Equity (Tables)

3 Months Ended

Apr. 03, 2020

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
	April 3, 2020		March 29, 2019
Employee stock options	$	2,232	$	1,430
Restricted stock		78		82
Restricted stock units		549		1,104
Nonemployee stock options		62		25
Total stock-based compensation expense	$	2,921	$	2,641

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
	April 3, 2020		March 29, 2019
Cost of sales	$	22	$	14
General and administrative		1,085		778
Marketing and selling		1,055		1,171
Research and development		759		678
Total stock-based compensation expense, net		2,921		2,641
Amounts capitalized as part of inventory		269		189
Total stock-based compensation expense, gross	$	3,190	$	2,830

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
	April 3, 2020			March 29, 2019
Expected dividend yield		0	%		0	%
Expected volatility		53	%		53	%
Risk-free interest rate		0.54	%		2.43	%
Expected term (in years)		5.72			5.67

Schedule of Share-based Compensation, Stock Options, Activity

A summary of stock option activity under the Plan for the three months ended April 3, 2020 is presented below:

	Stock Options (in 000’s)			Minimum Exercise Price		Maximum Exercise Price
Outstanding at January 3, 2020		4,326
Granted		603
Exercised		(196	)
Forfeited or expired		(6	)
Outstanding at April 3, 2020		4,727		$	4.73	$	43.84
Exercisable at April 3, 2020		3,231

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 three months ended April 3, 2020 is presented below:

	Restricted Stock (in 000’s)		Restricted Stock Units (in 000’s)
Unvested at January 3, 2020		11		104
Granted		—		97
Vested		—		(87	)
Forfeited or expired		—		(1	)
Unvested at April 3, 2020		11		113