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Stock option plan (Tables) | 12 Months Ended
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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: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | average | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | average | ​ | remaining | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | exercise | ​ | contractual | ​ | 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 |  | — | ​ |  | — |  |  | ​ |  |
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
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​
Schedule of share-based compensation, employee stock purchase plan, activity | ​
​ | ​ | ​
​ | ​ | 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: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | 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: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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