Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 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				Nine Months Ended
	September 30, 2022		October 1, 2021		September 30, 2022		October 1, 2021
Employee stock options	$	2,865	$	2,594	$	7,649	$	7,850
Restricted stock		67		109		618		507
Restricted stock units		1,249		700		3,242		2,048
Performance stock units		1,240		124		2,932		325
Nonemployee stock options		306		136		934		255
Total stock-based compensation expense	$	5,727	$	3,663	$	15,375	$	10,985

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 30, 2022		October 1, 2021		September 30, 2022		October 1, 2021
Cost of sales	$	233	$	61	$	409	$	150
General and administrative		2,584		1,671		7,171		4,925
Selling and marketing		1,335		851		3,548		2,637
Research and development		1,575		1,080		4,247		3,273
Total stock-based compensation expense, net		5,727		3,663		15,375		10,985
Amounts capitalized as part of inventory		361		383		1,379		1,082
Total stock-based compensation expense, gross	$	6,088	$	4,046	$	16,754	$	12,067

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 30, 2022			October 1, 2021			September 30, 2022			October 1, 2021
Expected dividend yield		0	%		0	%		0	%		0	%
Expected volatility		54	%		53	%		54	%		53	%
Risk-free interest rate		2.91	%		0.79	%		1.88	%		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 nine months ended September 30, 2022 is presented below:

	Stock Options (in 000’s)			Minimum Exercise Price		Maximum Exercise Price
Outstanding at December 31, 2021		2,435
Granted		443
Exercised		(417	)
Forfeited or expired		(23	)
Outstanding at September 30, 2022		2,438		$	5.34	$	154.96
Exercisable at September 30, 2022		1,778

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 nine months ended September 30, 2022 is presented below (shares in thousands):

	Restricted Stock			RSUs			PSUs
Unvested at December 31, 2021		3			131			10
Granted		6			116			113
Vested		(5	)		(57	)		(5	)
Unvested at September 30, 2022		4			190			118