Stock-based compensation (Tables)

9 Months Ended

Jun. 30, 2023

Share-Based Payment Arrangement [Abstract]

Schedule of Nonvested Restricted Stock Units Activity

Activity with respect to the Company’s restricted stock units during the nine months ended June 30, 2023 was as follows:

(in thousands, except per share data)	Shares	Weighted average grant date fair value per share
Nonvested shares at September 30, 2022	1,566	$	67.66
Granted	923	26.29
Vested/Issued	(486)	56.44
Forfeited	(332)	74.93
Nonvested shares at June 30, 2023	1,671	$	46.41

Schedule of Nonvested Performance-based Units Activity

Activity under the PSUs during the nine months ended June 30, 2023 is summarized below:

(in thousands, except per share data)	Shares	Weighted average grant date fair value per share
Nonvested shares at September 30, 2022	529	$	79.60
Granted	480	28.14
Vested/Issued	(18)	51.08
Forfeited	(291)	76.53
Nonvested at June 30, 2023	700	$	46.32

Schedule of Activity Under Option and Performance Stock Options

Options activity during the nine months ended June 30, 2023 is summarized below:

(in thousands, except per share data)	Shares	Weighted average exercise price per share		Weighted average remaining contractual term (years)	Aggregate intrinsic value
Outstanding at September 30, 2022	2,453	$	24.67	6.33	$	33,447
Forfeited	(117)	36.92		—	—
Exercised	(102)	11.82		—	889
Outstanding at June 30, 2023	2,234	$	24.61	5.51	$	7,165
Nonvested at June 30, 2023	184	38.87		6.57	96
Exercisable	2,050	$	23.33	5.41	$	7,069

Activity under the PSOs during the nine months ended June 30, 2023 is summarized below:

(in thousands, except per share data)	Shares	Weighted average exercise price per share		Weighted average remaining contractual term (years)	Aggregate intrinsic value
Outstanding at September 30, 2022	312	$	61.35	8.33	$	296
Exercisable at September 30, 2022	19	$	31.29	9.57	$	74
Nonvested at September 30, 2022	293	63.27		8.25	222
Vested	(237)	$	70.84	—	$	—
Nonvested at June 30, 2023	56	$	31.29	8.82	$	—
Exercisable at June 30, 2023	256	67.95		7.31	—
Outstanding at June 30, 2023	312	$	61.35	7.58	$	—

Schedule of Stock-Based Compensation Expenses

Total stock-based compensation expense recognized was as follows:

	Three months ended June 30,				Nine months ended June 30,
(in thousands)	2023		2022		2023		2022
Cost of revenues	$	1,286	$	1,228	$	3,898	$	3,347
Research and development	3,329		5,642		10,837		14,506
Selling, general and administrative	5,983		12,989		3,796		42,410
Total stock-based compensation	$	10,598	$	19,859	$	18,531	$	60,263

Summary of Stock Option Valuation Assumptions

The number of shares reserved for issuance at June 30, 2023 was as follows:

(In thousands)	Shares available
Reserved at September 30, 2022	507
Additional shares authorized	249
Shares issued during the period	(132)
Reserved at June 30, 2023	624