Stockholders' Equity (Tables)

6 Months Ended

Jul. 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				Six Months Ended
	July 1, 2022		July 2, 2021		July 1, 2022		July 2, 2021
Employee stock options	$	2,457	$	2,784	$	4,784	$	5,256
Restricted stock		442		232		551		398
Restricted stock units		1,231		811		1,993		1,348
Performance stock units		1,310		108		1,692		201
Nonemployee stock options		314		57		628		119
Total stock-based compensation expense	$	5,754	$	3,992	$	9,648	$	7,322

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				Six Months Ended
	July 1, 2022		July 2, 2021		July 1, 2022		July 2, 2021
Cost of sales	$	106	$	54	$	176	$	89
General and administrative		2,806		1,815		4,587		3,254
Selling and marketing		1,324		953		2,213		1,786
Research and development		1,518		1,170		2,672		2,193
Total stock-based compensation expense, net		5,754		3,992		9,648		7,322
Amounts capitalized as part of inventory		652		390		1,018		699
Total stock-based compensation expense, gross	$	6,406	$	4,382	$	10,666	$	8,021

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						Six Months Ended
	July 1, 2022			July 2, 2021			July 1, 2022			July 2, 2021
Expected dividend yield		0	%		0	%		0	%		0	%
Expected volatility		54	%		53	%		54	%		53	%
Risk-free interest rate		3.27	%		0.83	%		1.83	%		0.84	%
Expected term (in years)		5.10			5.38			5.10			5.38

Schedule of Share-based Compensation, Stock Options, Activity

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

	Stock Options (in 000’s)			Minimum Exercise Price		Maximum Exercise Price
Outstanding at December 31, 2021		2,435
Granted		421
Exercised		(251	)
Forfeited or expired		(16	)
Outstanding at July 1, 2022		2,589		$	5.34	$	154.96
Exercisable at July 1, 2022		1,873

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 six months ended July 1, 2022 is presented below (shares in thousands):

	Restricted Stock			RSUs			PSUs
Unvested at December 31, 2021		3			131			10
Granted		6			113			113
Vested		(5	)		(45	)		(5	)
Unvested at July 1, 2022		4			199			118