Stockholders' Equity (Tables)

3 Months Ended

Apr. 01, 2022

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 1, 2022		April 2, 2021
Employee stock options	$	2,327	$	2,472
Restricted stock		109		166
Restricted stock units		762		537
Performance stock units		382		93
Nonemployee stock options		314		62
Total stock-based compensation expense	$	3,894	$	3,330

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 1, 2022		April 2, 2021
Cost of sales	$	70	$	35
General and administrative		1,781		1,439
Selling and marketing		889		833
Research and development		1,154		1,023
Total stock-based compensation expense, net		3,894		3,330
Amounts capitalized as part of inventory		366		309
Total stock-based compensation expense, gross	$	4,260	$	3,639

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 1, 2022			April 2, 2021
Expected dividend yield		0	%		0	%
Expected volatility		54	%		53	%
Risk-free interest rate		1.71	%		0.84	%
Expected term (in years)		5.10			5.38

Schedule of Share-based Compensation, Stock Options, Activity

A summary of stock option activity under the Plan for three months ended April 1, 2022 is presented below:

	Stock Options (in 000’s)			Minimum Exercise Price		Maximum Exercise Price
Outstanding at December 31, 2021		2,435
Granted		388
Exercised		(49	)
Forfeited or expired		(7	)
Outstanding at April 1, 2022		2,767		$	5.34	$	154.96
Exercisable at April 1, 2022		1,997

Schedule of Share-based Compensation, Restricted Stock, RSUs and PSUs Activity

A summary of restricted stock, RSUs and PSUs activity under the Plan for the three months ended April 1, 2022 is presented below (shares in thousands):

	Restricted Stock		RSUs			PSUs
Unvested at December 31, 2021		3		131			10
Granted		—		113			113
Vested		—		(45	)		—
Unvested at April 1, 2022		3		199			123