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Net loss per share attributable to common stockholders (Tables) | 12 Months Ended
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Sep. 30, 2021
Net loss per share attributable to common stockholders |
Computation of the Company's Basic and Diluted Net Loss Per Share Attributable to Common Stockholders | The following table sets forth the computation of the Company’s basic and diluted net loss per share attributable to common stockholders: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended September 30,
(in thousands, except per share data) |  | 2021 |  | 2020 |  | 2019
Numerator: |  | ​ |  |  | ​ |  |  | ​ |
Net loss attributable to common stockholders | ​ | $ | (152,098) | ​ | $ | (139,931) | ​ | $ | (107,669)
Denominator: | ​ |  |  | ​ |  |  | ​ |  |
Weighted-average shares used in computing net loss per share, basic and diluted | ​ |  | 48,251 | ​ |  | 39,190 | ​ |  | 27,462
Net loss per share attributable to common stockholders, basic and diluted | ​ | $ | (3.15) | ​ | $ | (3.57) | ​ | $ | (3.92)
Summary of Calculation of Diluted Net Loss Per Share | The potentially dilutive common shares that were excluded from the calculation of diluted net loss per share because their effect would have been antidilutive for the periods presented are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended September 30,
(in thousands) |  | 2021 |  | 2020 |  | 2019
Shares subject to options to purchase common stock |  | 3,131 |  | 3,948 |  | 3,551
Unvested restricted shares of common stock |  | — |  | — |  | 24
Unvested restricted stock units |  | 707 |  | 569 |  | 462
Unvested shares of common stock issued upon early exercise of stock options |  | 3 |  | 17 |  | 38
Shares subject to employee stock purchase plan |  | 27 |  | 33 |  | 76
Shares subject to warrants to purchase common stock |  | — |  | 26 |  | 26
Total |  | 3,868 |  | 4,593 |  | 4,177

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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