Employee Benefit Plans (Tables)

9 Months Ended

Sep. 29, 2019

Employee Benefit and Share-based Payment Arrangement, Noncash Expense [Abstract]

Schedule of Stock Option Activity

Stock option activity during the nine months ended September 29, 2019 was as follows:

	Number of shares		Weighted Average Exercise Price Per Share
	(In thousands)		(In dollars)
Outstanding as of December 31, 2018	1,969		$	25.30
Granted	502		$	26.61
Exercised	(226	)	$	20.31
Cancelled	(16	)	$	36.27
Expired	(15	)	$	40.00
Outstanding as of September 29, 2019	2,214		$	25.93

Schedule of RSU Activity

RSU activity during the nine months ended September 29, 2019 was as follows:

	Number of shares		Weighted Average Grant Date Fair Value Per Share
	(In thousands)		(In dollars)
Outstanding as of December 31, 2018	1,627		$	34.31
Granted	693		$	31.37
Vested	(535	)	$	31.62
Cancelled	(105	)	$	35.12
Outstanding as of September 29, 2019	1,680		$	33.90

Schedule of Weighted Average Assumptions

The table below sets forth the weighted average assumptions used to estimate the fair value of option grants and purchase rights granted during the three and nine months ended September 29, 2019 and September 30, 2018.

	Three Months Ended								Nine Months Ended
	Stock Options				ESPP				Stock Options				ESPP
	September 29, 2019		September 30, 2018		September 29, 2019		September 30, 2018		September 29, 2019		September 30, 2018		September 29, 2019		September 30, 2018
Expected life (in years)	6.2		4.4		0.5		0.5		6.2		4.4		0.5		0.5
Risk-free interest rate	1.85	%	2.79	%	1.83	%	2.22	%	1.85	%	2.36	%	2.06	%	2.00	%
Expected volatility	33.9	%	33.5	%	44.5	%	38.8	%	33.9	%	31.1	%	43.9	%	37.9	%
Dividend yield	—		—		—		—		—		—		—		—

Schedule of Total Stock-Based Compensation Expense Resulting from Stock Options, Restricted Stock Awards, and the Employee Stock Purchase Plan

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

	Three Months Ended				Nine Months Ended
	September 29, 2019		September 30, 2018		September 29, 2019		September 30, 2018
	(In thousands)
Cost of revenue	$	706	$	619	$	2,129	$	1,754
Research and development	1,496		1,037		3,976		3,171
Sales and marketing	2,097		1,970		6,223		6,363
General and administrative	2,687		2,492		7,855		8,940
Total stock-based compensation	$	6,986	$	6,118	$	20,183	$	20,228