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Stockholders' Equity (Tables)

6 Months Ended

Jul. 03, 2020

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 3, 2020				June 28, 2019				July 3, 2020				June 28, 2019
Employee stock options		$	2,505			$	2,162			$	4,737			$	3,592
Restricted stock			76				77				154				159
Restricted stock units			274				311				823				1,415
Nonemployee stock options			63				29				125				54
Total stock-based compensation expense		$	2,918			$	2,579			$	5,839			$	5,220

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 3, 2020				June 28, 2019				July 3, 2020				June 28, 2019
Cost of sales		$	30			$	22			$	52			$	36
General and administrative			1,209				1,018				2,294				1,796
Marketing and selling			812				690				1,867				1,861
Research and development			867				849				1,626				1,527
Total stock-based compensation expense, net			2,918				2,579				5,839				5,220
Amounts capitalized as part of inventory			291				276				560				465
Total stock-based compensation expense, gross		$	3,209			$	2,855			$	6,399			$	5,685

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 3, 2020				June 28, 2019				July 3, 2020				June 28, 2019
Expected dividend yield			0	%			0	%			0	%			0	%
Expected volatility			53	%			53	%			53	%			53	%
Risk-free interest rate			0.31	%			2.05	%			0.53	%			2.41	%
Expected term (in years)			5.72				5.67				5.72				5.67

Schedule of Share-based Compensation, Stock Options, Activity

A summary of stock option activity under the Plan for the six months ended July 3, 2020 is presented below:

		Stock Options (in 000’s)				Minimum Exercise Price				Maximum Exercise Price
Outstanding at January 3, 2020			4,326
Granted			609
Exercised			(876	)
Forfeited or expired			(12	)
Outstanding at July 3, 2020			4,047			$	5.05			$	43.84
Exercisable at July 3, 2020			2,717

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

A summary of restricted stock and RSU activity under the Plan for the six months ended July 3, 2020 is presented below:

		Restricted Stock (in 000’s)				Restricted Stock Units (in 000’s)
Unvested at January 3, 2020			11				104
Granted			—				97
Vested			(11	)			(89	)
Forfeited or expired			—				(1	)
Unvested at July 3, 2020			—				111

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