Stockholders' Equity (Tables)

12 Months Ended

Jan. 03, 2020

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 2019 (in thousands):

	Fair Value
Stock options	$	14,813
Restricted stock units		728
Restricted stock		313
Total stock-based compensation expense	$	15,854

Schedule of Compensation Cost

The cost that has been charged against income for stock-based compensation is set forth below (in thousands):

	Years Ended
	2019		2018		2017
Employee stock option	$	8,144	$	4,013	$	1,731
Restricted stock		320		274		186
Restricted stock units		1,905		2,120		1,226
Nonemployee stock options		178		355		18
Total stock-based compensation expense	$	10,547	$	6,762	$	3,161

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
	2019		2018		2017
Cost of sales	$	52	$	15	$	8
General and administrative		4,010		2,635		1,487
Marketing and selling		3,318		1,805		805
Research and development		3,167		2,307		861
Total stock-based compensation expense, net		10,547		6,762		3,161
Amounts capitalized as part of inventory		1,017		637		372
Total stock-based compensation expense, gross	$	11,564	$	7,399	$	3,533

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

As of January 3, 2020, total unrecognized compensation cost related to non-vested stock-based compensation arrangements granted under the Plan were as follows (in thousands):

	2019
Stock options	$	14,817
Restricted stock and restricted stock units		594
Total unrecognized stock-based compensation cost	$	15,411

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
	2019			2018			2017
Expected dividend yield		0	%		0	%		0	%
Expected volatility		53	%		53	%		57	%
Risk-free interest rate		2.40	%		2.71	%		1.96	%
Expected term (in years)		5.66			5.72			5.67

Schedule of Share-based Compensation, Stock Options, Activity

A summary of option activity under the Plan for the year ended January 3, 2020 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 December 28, 2018		3,920		$	11.80
Granted		824			35.40
Exercised		(388	)		8.92
Forfeited or expired		(30	)		25.87
Outstanding at January 3, 2020		4,326		$	16.46		6.51	$	78,995
Exercisable at January 3, 2020		3,047		$	10.66		5.54	$	72,393

Share-based Compensation, Performance Shares Award Unvested Activity

A summary of unvested options activity under the Plan for the year ended January 3, 2020 was as follows:

	Shares (in 000’s)			Weighted- Average Grant-Date Fair Value
Unvested at December 28, 2018		1,260		$	9.67
Granted		824			17.95
Forfeited or expired		(30	)		13.29
Vested		(775	)		8.83
Unvested at January 3, 2020		1,279		$	15.44

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
	2019		2018		2017
Weighted-average grant-date fair value	$	17.95	$	11.95	$	5.42
Intrinsic value of options (in thousands)	$	9,955	$	13,699	$	3,065

Restricted Stock

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

A summary of restricted stock activity under the Plan for the year ended January 3, 2020 was as follows:

	Shares (in 000’s)			Weighted- Average Grant- Date Fair Value
Outstanding at December 28, 2018		11		$	29.80
Granted		11			29.39
Vested		(11	)		29.80
Outstanding at January 3, 2020		11		$	29.39

Restricted Stock Units (RSUs)

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

A summary of restricted stock units’ activity under the Plan for the year ended January 3, 2020 was as follows:

	Units (in 000’s)			Weighted- Average Grant- Date Fair Value
Outstanding at December 28, 2018		322		$	10.46
Granted		19			37.98
Vested		(229	)		12.58
Forfeited or expired		(8	)		11.57
Outstanding at January 3, 2020		104		$	10.79