Stockholders' Equity (Tables)

12 Months Ended

Jan. 01, 2021

Stockholders Equity Note [Abstract]

Schedule of Share-based Compensation, Fair Value of Stock-Based Compensation Granted

The following table represents the fair value of stock-based compensation granted during the year ended 2020 (in thousands):

	Fair Value
Stock options	$	8,592
Restricted stock units		4,260
Performance stock units		790
Restricted stock		644
Total stock-based compensation expense	$	14,286

Schedule of Compensation Cost

The Company recorded stock-based compensation expense by award as follows (in thousands):

	Years Ended
	2020		2019		2018
Employee stock option	$	9,577	$	8,144	$	4,013
Restricted stock		428		320		274
Restricted stock units		1,732		1,905		2,120
Performance stock units		147		—		—
Nonemployee stock options		262		178		355
Total stock-based compensation expense	$	12,146	$	10,547	$	6,762

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

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

	Years Ended
	2020		2019		2018
Cost of sales	$	112	$	52	$	15
General and administrative		4,925		4,010		2,635
Selling and marketing		3,471		3,318		1,805
Research and development		3,638		3,167		2,307
Total stock-based compensation expense, net		12,146		10,547		6,762
Amounts capitalized as part of inventory		1,129		1,017		637
Total stock-based compensation expense, gross	$	13,275	$	11,564	$	7,399

Schedule of Unrecognized Compensation Cost, Non-Vested Stock-Based Compensation Arrangements

As of January 1, 2021, total unrecognized compensation cost related to non-vested stock-based compensation arrangements granted under the Plan were as follows (in thousands):

	2020
Stock options	$	12,545
Restricted stock, restricted stock units and performance stock units		3,917
Total unrecognized stock-based compensation cost	$	16,462

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.

	Years Ended
	2020			2019			2018
Expected dividend yield		0	%		0	%		0	%
Expected volatility		53	%		53	%		53	%
Risk-free interest rate		0.53	%		2.40	%		2.71	%
Expected term (in years)		5.72			5.66			5.72

Schedule of Share-based Compensation, Stock Options, Activity

A summary of option activity under the Plan for the year ended January 1, 2021 is presented below:

	Shares (in 000’s)			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (years)		Aggregate Intrinsic Value (in 000’s)
Outstanding at January 3, 2020		4,326		$	16.46
Granted		621			28.78
Exercised		(1,507	)		13.70
Forfeited or expired		(22	)		32.35
Outstanding at January 1, 2021		3,418		$	19.80		6.60	$	203,087
Exercisable at January 1, 2021		2,372		$	15.05		5.66	$	152,218

Share-based Compensation, Performance Shares Award Unvested Activity

A summary of unvested options activity under the Plan for the year ended January 1, 2021 was as follows:

	Shares (in 000’s)			Weighted-Average Grant-Date Fair Value
Unvested at January 3, 2020		1,279		$	15.44
Granted		621			13.85
Forfeited or expired		(22	)		16.52
Vested		(832	)		14.66
Unvested at January 1, 2021		1,046		$	15.09

Summary of Weighted Average Grant Date Fair Value of Options Granted and Total intrinsic Value of options Exercised

The weighted average grant date fair value of options granted and the total intrinsic value of options exercised were as follows:

	Years Ended
	2020		2019		2018
Weighted-average grant-date fair value	$	13.85	$	17.95	$	11.95
Intrinsic value of options (in thousands)	$	59,771	$	9,955	$	13,699

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

A summary of restricted stock, RSU and PSU activity under the Plan for the year ended January 1, 2021was as follows:

	Restricted Stock					Restricted Stock Units					Performance Stock Units
	Units (in 000’s)			Weighted- Average Grant- Date Fair Value		Units (in 000’s)			Weighted- Average Grant- Date Fair Value		Units (in 000’s)		Weighted- Average Grant- Date Fair Value
Outstanding at January 3, 2020		11		$	29.39		104		$	10.79		—	$	—
Granted		11			58.25		127			33.57		15		51.42
Vested		(11	)		29.82		(108	)		12.52		—		—
Forfeited or expired		—			—		(1	)		13.80		—		—
Outstanding at January 1, 2021		11		$	59.06		122		$	32.97		15	$	51.42