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Employee Benefit Plans (Tables)

9 Months Ended

Sep. 27, 2020

Employee Benefits And Share Based Compensation [Abstract]

Stock option activity during the nine months ended September 27, 2020 was as follows:

	Number of Shares			Weighted Average Exercise Price Per Share
	(In thousands)			(In dollars)
Outstanding as of December 31, 2019		2,188		$	26.03
Exercised		(522	)	$	21.10
Cancelled		(20	)	$	35.85
Expired		(30	)	$	35.97
Outstanding as of September 27, 2020		1,616		$	27.32

Schedule of RSU Activity

RSU activity during the nine months ended September 27, 2020 was as follows:

	Number of Shares			Weighted Average Grant Date Fair Value Per Share
	(In thousands)			(In dollars)
Outstanding as of December 31, 2019		1,587		$	33.95
Granted		685		$	25.00
Vested		(598	)	$	32.51
Cancelled		(70	)	$	34.79
Outstanding as of September 27, 2020		1,604		$	30.63

Schedule of Performance Shares Activity

Performance shares activity during nine months ended September 27, 2020 was as follows:

	Number of Shares		Weighted Average Grant Date Fair Value Per Share
	(In thousands)		(In dollars)
Outstanding as of December 31, 2019		—	$	—
Granted⁽¹⁾		141	$	28.22
Outstanding as of September 27, 2020		141	$	28.22

⁽¹⁾Shares granted represented the aggregate target numbers of shares that could potentially vest.

Schedule of Weighted Average Assumptions

The following table sets forth the weighted average assumptions used to estimate the fair value of option grants and purchase rights granted under the ESPP during the three and nine months ended September 27, 2020 and September 29, 2019:

	Three Months Ended										Nine Months Ended
	September 27, 2020	September 29, 2019			September 27, 2020			September 29, 2019			September 27, 2020	September 29, 2019			September 27, 2020			September 29, 2019
	Stock Options				ESPP						Stock Options				ESPP
Expected life (in years)	N/A		6.2			0.5			0.5		N/A		6.2			0.5			0.5
Risk-free interest rate	N/A		1.85	%		0.12	%		1.83	%	N/A		1.85	%		0.72	%		2.06	%
Expected volatility	N/A		33.9	%		66.4	%		44.5	%	N/A		33.9	%		54.8	%		43.9	%
Dividend yield	N/A		—			—			—		N/A		—			—			—

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				Nine Months Ended
	September 27, 2020		September 29, 2019		September 27, 2020		September 29, 2019
	(In thousands)
Cost of revenue	$	923	$	706	$	3,129	$	2,129
Research and development		1,138		1,496		3,879		3,976
Sales and marketing		1,927		2,097		5,596		6,223
General and administrative		3,230		2,687		10,122		7,855
Total	$	7,218	$	6,986	$	22,726	$	20,183