Employee Benefit Plans (Tables)

6 Months Ended

Jun. 27, 2021

Employee Benefits And Share Based Compensation [Abstract]

Schedule of Stock Option Activity

Stock option activity during the six months ended June 27, 2021 was as follows:

	Number of Shares			Weighted Average Exercise Price Per Share
	(In thousands)			(In dollars)
Outstanding as of December 31, 2020		1,333		$	27.86
Exercised		(292	)	$	23.43
Outstanding as of June 27, 2021		1,041		$	29.10

Schedule of RSU Activity

RSU activity during the six months ended June 27, 2021 was as follows:

	Number of Shares			Weighted Average Grant Date Fair Value Per Share
	(In thousands)			(In dollars)
Outstanding as of December 31, 2020		1,584		$	30.66
Granted		479		$	39.42
Vested		(507	)	$	31.94
Cancelled		(90	)	$	32.67
Outstanding as of June 27, 2021		1,466		$	32.96

Schedule of Performance Shares Activity

Performance shares activity during the six months ended June 27, 2021 was as follows:

	Number of Shares		Weighted Average Grant Date Fair Value Per Share
	(In thousands)		(In dollars)
Outstanding as of December 31, 2020		141	$	28.22
Granted		—	$	—
Vested		—	$	—
Cancelled		—	$	—
Outstanding as of June 27, 2021		141	$	28.22

Schedule of Weighted Average Assumptions

The following table sets forth the weighted average assumptions used to estimate the fair value of purchase rights granted under the ESPP during the six months ended June 27, 2021 and June 28, 2020:

	Six Months Ended
	June 27, 2021			June 28, 2020
	ESPP
Expected life (in years)		0.5			0.5
Risk-free interest rate		0.06	%		1.55	%
Expected volatility		50.0	%		38.8	%
Dividend yield		—			—

Schedule of Total Stock-Based Compensation Expense Resulting from Stock Options, RSUs, Performance Shares and the ESPP

The following table sets forth the stock-based compensation expense resulting from stock options, RSUs, performance shares and the ESPP included in the Company's unaudited condensed consolidated statements of operations:

	Three Months Ended				Six Months Ended
	June 27, 2021		June 28, 2020		June 27, 2021		June 28, 2020
	(In thousands)
Cost of revenue	$	362	$	1,501	$	1,196	$	2,206
Research and development		1,272		1,707		2,418		2,741
Sales and marketing		1,953		1,890		3,733		3,669
General and administrative		3,315		4,074		6,515		6,892
Total	$	6,902	$	9,172	$	13,862	$	15,508