Stock-based compensation (Tables)

3 Months Ended

Dec. 31, 2022

Share-based Payment Arrangement [Abstract]

Schedule of Nonvested Restricted Stock Units Activity

Activity with respect to the Company’s restricted stock units during the three months ended December 31, 2022 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	589	26.28
Vested/Issued	(102)	66.98
Forfeited	(235)	81.89
Nonvested shares at December 31, 2022	1,818	$	52.41

Schedule of Nonvested Performance-based Units Activity

Activity under the PSUs during the three months ended December 31, 2022 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	423	26.50
Vested/Issued	(6)	90.44
Forfeited	(187)	86.38
Nonvested at December 31, 2022	759	$	48.28

Schedule of Activity Under Option and Performance Stock Options

Options activity during the three months ended December 31, 2022 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
Granted	—	—		—	—
Forfeited	(37)	42.87		—	—
Exercised	(35)	17.17		—	312
Outstanding at December 31, 2022	2,381	$	24.49	6.06	$	10,715
Nonvested at December 31, 2022	427	33.87		6.92	423
Exercisable	1,954	$	22.44	5.87	$	10,292

Activity under the PSOs during the three months ended December 31, 2022 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 December 31, 2022	56	$	31.29	9.32	$	—
Exercisable at December 31, 2022	256	67.95		7.81	—
Outstanding at December 31, 2022	312	$	61.35	8.08	$	—

Schedule of Stock-Based Compensation Expenses

Total stock-based compensation (credit)/expense recognized was as follows:

	Three months ended December 31,
(in thousands)	2022		2021
Cost of revenues	$	1,142	$	878
Research and development	4,418		4,027
Selling, general and administrative	(7,885)		13,163
Total stock-based compensation	$	(2,325)	$	18,068

Summary of Stock Option Valuation Assumptions

The number of shares reserved for issuance at December 31, 2022 was as follows:

(In thousands)	Shares available
Outstanding at September 30, 2022	507
Additional shares authorized	250
Shares issued during the period	—
Outstanding at December 31, 2022	757