Stock-based compensation (Tables)

3 Months Ended

Dec. 31, 2020

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Activity Under The Equity Incentive Plans

Activity under the equity incentive plans during the three months ended December 31, 2020 is summarized below:

(In thousands, except per share data)	Shares available			Options outstanding			Weighted average exercise price per share		Weighted average remaining contractual term (years)		Aggregate intrinsic value
Outstanding at September 30, 2020		1,034			3,913		$	24.35		8.1	$	204,365
Stock options granted		(33	)		33			100.21
Stock options exercised		—			(348	)		17.59
Stock options forfeited		29			(29	)		31.32
Restricted stock units granted		(289	)		—			—
Forfeiture of restricted stock units		9			—			—
Shares withheld for payment of taxes		24			—			—
Outstanding at December 31, 2020		774			3,569		$	24.99		7.9	$	415,052
Vested or expected to vest at December 31, 2020					3,569		$	24.99		7.9	$	415,052
Vested and exercisable at December 31, 2020					1,300		$	14.99		7.0	$	164,229

Total Stock-based Compensation Expense

Total stock-based compensation expense recognized was as follows:

	Three months ended December 31,
(in thousands)	2020		2019
Cost of revenues	$	487	$	360
Research and development		2,001		728
Selling, general and administrative		4,534		2,609
Total stock-based compensation	$	7,022	$	3,697

Schedule of Nonvested Restricted Stock Units Activity

Activity with respect to the Company’s RSUs during the three months ended December 31, 2020 was as follows:

(in thousands, except per share data)	Number of Shares			Weighted average grant date fair value per share		Weighted average remaining contractual term (years)		Aggregate Intrinsic Value
Outstanding at September 30, 2020		569		$	32.96		3.2	$	43,260
Restricted stock units granted		289			100.13
Restricted stock units vested		(56	)		24.86
Restricted stock units forfeited		(9	)		65.63
Outstanding at December 31, 2020		793		$	57.67		3.3	$	112,013
Expected to vest at December 31, 2020		793		$	57.67		3.3	$	112,013

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The number of shares reserved for issuance as at December 31, 2020 is as follows:

(In thousands)	Shares available
Outstanding at September 30, 2020		179
Additional shares authorized		250
Shares issued during the period		—
Outstanding at December 31, 2020		429