Stock-based compensation (Tables)

9 Months Ended

Jun. 29, 2019

Share-based Payment Arrangement [Abstract]

Schedule of stock option activity

The summary of the Company’s stock option activity is as follows:

	Number of Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value
					(in years)	(in thousands)
Outstanding at September 29, 2018	48,504,182		$	10.33	6.6	$	276,959
Granted	1,714,328
Exercised	(5,869,451	)
Forfeited	(4,247,115	)
Outstanding at June 29, 2019	40,101,944		$	11.10	6.4	$	82,902
At June 29, 2019
Options exercisable	27,343,825		$	9.62	5.4	$	82,475
Options vested and expected to vest	38,174,480		$	10.93	6.3	$	82,792

Schedule of restricted stock unit activity

The summary of the Company’s unvested RSU activity is as follows:

	Number of Units		Weighted Average Grant Date Fair Value		Aggregate Intrinsic Value
					(in thousands)
Unvested at September 29, 2018	—		$	—	$	—
Granted	7,369,802
Vested	(435,978	)
Forfeited	(225,899	)
Unvested at June 29, 2019	6,707,925		$	11.31	$	76,068
At June 29, 2019
Units expected to vest	5,118,685		$	11.32	$	58,046

Schedule of stock-based compensation expense

Total stock-based compensation expense by function category was as follows:

	Three Months Ended				Nine Months Ended
	June 29, 2019		June 30, 2018		June 29, 2019		June 30, 2018
(In thousands)
Cost of revenue	$	298	$	49	$	701	$	156
Research and development	4,904		3,651		12,792		10,417
Sales and marketing	3,608		4,391		9,416		12,414
General and administrative	4,598		2,242		10,616		6,410
Total stock-based compensation expense	$	13,408	$	10,333	$	33,525	$	29,397