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Stock option plan (Tables)

12 Months Ended

Sep. 30, 2021

Stock option plan

Schedule of activity under the equity incentive plans

Activity under the equity incentive plans during the year ended September 30, 2021 is as follows:

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​

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Weighted

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Weighted

​

average

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average

​

remaining

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​

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​

​

​

exercise

​

contractual

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Aggregate

​

​

Shares

​

Options

​

price

​

term

​

intrinsic

(In thousands, except per share data)

available

outstanding

per share

(years)

value

Outstanding at September 30, 2020

1,034

3,913

​

$

24.35

8.1

​

$

204,365

Additional shares authorized

1,000

—

​

—

​

Stock options granted

(175)

175

​

69.03

​

Stock options exercised

—

(805)

​

18.05

​

Stock options forfeited

151

(151)

​

39.25

​

Restricted stock units granted

(436)

—

​

—

​

Forfeiture of restricted stock units

61

—

​

—

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Shares withheld for payment of taxes

93

—

​

—

​

Outstanding at September 30, 2021

1,728

3,132

​

$

27.15

7.3

​

$

251,343

Vested or expected to vest at September 30, 2021

​

​

3,132

​

$

27.15

7.3

​

$

251,343

Vested and exercisable at September 30, 2021

​

​

1,633

​

$

18.05

6.6

​

$

145,204

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Schedule of share-based compensation, employee stock purchase plan, activity

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​	​	​
​	​	Shares
(In thousands)		available
Outstanding at September 30, 2020		179
Additional shares authorized		250
Shares issued during the period		(74)
Outstanding at September 30, 2021		355

​

Schedule of nonvested restricted stock units activity

Activity with respect to the Company’s restricted stock units during the year ended September 30, 2021 is as follows:

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​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	Weighted		​	​		​	​
​	​	​	​	average		​	Weighted	​	​	​
​	​	​	​	grant		​	average	​	​	​
​	​	​	​	date fair		​	remaining	​	Aggregate
​	​	Number	​	value per		​	contractual	​	Intrinsic
(in thousands, except per share data)		of Shares		share			term (years)		Value
Outstanding at September 30, 2020		569	​	$	32.96		3.2	​	$	43,260
Restricted stock units granted		436	​	$	113.06		—	​		—
Restricted stock units vested		(237)	​	$	44.36		—	​		—
Restricted stock units forfeited		(61)	​	$	86.60		—	​		—
Outstanding at September 30, 2021		707	​	$	73.86		2.7	​	$	75,629
Expected to vest at September 30, 2021		707	​	$	73.86		2.7	​	$	75,629

​

Schedule of stock-based compensation expenses

Total stock-based compensation expense recognized were as follows:

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​	​	​	​	​	​	​	​	​	​
​	​	Year ended
​	​	September 30,
(in thousands)		2021			2020			2019
Cost of revenues	​	$	2,678	​	$	1,290	​	$	1,345
Research and development	​		10,166	​		3,346	​		2,378
Selling, general and administrative	​		24,154	​		12,460	​		7,447
Total stock-based compensation	​	$	36,998	​	$	17,096	​	$	11,170

​

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

The fair value of options granted during the years ended September 30, 2021, 2020 and 2019, respectively, were calculated using the weighted average assumptions set forth below:

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​	​	​	​	​	​	​	​
​	​	Year ended
​	​	September 30,
​		2021		2020		2019
Expected term (years)		6.1		6.2		6.4	​
Expected volatility		64.4	%	62.1	%	60.2	%
Risk-free interest rate		1.0	%	1.3	%	2.7	%
Dividend yield		—	%	—	%	—	%

​

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Tabular disclosure of the changes in outstanding nonvested restricted stock units.

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Tabular disclosure of employee stock purchase plan activity.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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