Share-Based Compensation (Tables)

The following table shows a summary of share-based compensation expense included in the condensed consolidated statements of operations (in thousands):



	Three Months Ended				Six Months Ended
	April 3, 2020		March 29, 2019		April 3, 2020		March 29, 2019
Cost of revenue	$	995	$	841	$	1,957	$	1,514
Research and development	4,111		1,200		7,018		4,022
Selling, general and administrative	5,170		6,035		9,451		11,813
Total share-based compensation expense	$	10,276	$	8,076	$	18,426	$	17,349

A summary of stock option activity for the six months ended April 3, 2020 is as follows (in thousands, except per share amounts and contractual term):



	Number of Shares		Weighted-Average Exercise Price per Share		Weighted-Average Remaining Contractual Term (in Years)	Aggregate Intrinsic Value
Options outstanding - September 27, 2019	376		$	13.58
Exercised	(18	)	6.73
Forfeited, canceled or expired	—		19.45
Options outstanding - April 3, 2020	358		$	13.93	6.84	$	1,653
Options vested and expected to vest - April 3, 2020	358		13.93		6.84	1,653
Options exercisable - April 3, 2020	73		$	10.55	2.40	$	580

A summary of RSAs, RSUs and PRSUs activity for the six months ended April 3, 2020 is as follows:



	Number of RSAs, RSUs and PRSUs (in thousands)		Weighted- Average Grate Date Fair Value		Aggregate Intrinsic Value (in thousands)
Balance at September 27, 2019	2,613		$	21.81	$	56,649
Granted	1,177		21.80
Vested and released	(564	)	26.98
Forfeited, canceled or expired	(238	)	23.18
Balance at April 3, 2020	2,988		$	20.72	$	55,333