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Income taxes (Tables) | 12 Months Ended
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Sep. 30, 2021
Income taxes |
Schedule of domestic and foreign components of pre-tax loss | The domestic and foreign components of pre-tax loss for the year ended September 30, 2021, 2020, and 2019 are as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended September 30,
(in thousands) | ​ | 2021 | ​ | 2020 | ​ | 2019
US |  | (149,533) |  | (138,016) |  | (107,847)
Foreign |  | (4,495) |  | (1,533) |  | 470
Total |  | (154,028) |  | (139,549) |  | (107,377)
Schedule of components of the provision for income taxes | ​ The components of the provision for income taxes for the year ended September 30, 2021, 2020, and 2019 are as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended September 30,
(in thousands) |  | 2021 |  | 2020 |  | 2019
Current |  |  |  |  |  |
Federal |  | — |  | — |  | —
State |  | (29) |  | — |  | 108
Foreign |  | 108 |  | 382 |  | 184
Total Current |  | 79 |  | 382 |  | 292
​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred |  |  |  |  |  |
Federal |  | (2,268) |  | — |  | —
State |  | 259 |  | — |  | —
Foreign |  | — |  | — |  | —
Total Deferred |  | (2,009) |  | — |  | —
​ | ​ | ​ | ​ | ​ | ​ | ​
Total Provision |  | (1,930) |  | 382 |  | 292
Schedule of effective income tax rate reconciliation | The following is a reconciliation of the statutory federal income tax rate to the Company’s effective tax rate:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended | ​
​ |  | September 30, | ​
​ |  | 2021 |  | 2020 |  | 2019 | ​
Tax expense computed at the federal statutory rate |  | 21 | % | 21 | % | 21 | %
Change in valuation allowance |  | (33) | % | (25) | % | (22) | %
Research and development credit benefit |  | 3 | % | 1 | % | 1 | %
Business combination |  | (2) | % | — |  | — |
Stock-based compensation |  | 12 | % | 3 | % | — | ​
Total income tax expense |  | 1 | % | — | % | — | %
Schedule of deferred tax assets and liabilities | The significant components of the Company’s deferred tax assets and liabilities are as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30,
(in thousands) |  | 2021 |  | 2020
Net operating loss carryforwards | ​ | $ | 163,782 | ​ | $ | 112,434
Research and development credit carryforwards | ​ |  | 20,163 | ​ |  | 9,407
Operating lease liability | ​ |  | 14,890 | ​ |  | 7,506
Other | ​ |  | 11,631 | ​ |  | 5,639
Gross deferred tax assets | ​ |  | 210,466 | ​ |  | 134,986
Less: Valuation allowance | ​ |  | (190,428) | ​ |  | (127,336)
Net deferred tax assets | ​ |  | 20,038 | ​ |  | 7,650
Fixed assets | ​ |  | (785) | ​ |  | (105)
Operating lease right-of-use asset | ​ |  | (14,893) | ​ |  | (7,498)
Intangible assets | ​ |  | (4,360) | ​ |  | (47)
Gross deferred tax liabilities | ​ |  | (20,038) | ​ |  | (7,650)
Total net deferred tax asset | ​ | $ | — | ​ | $ | —
Schedule of Unrecognized Tax Benefits Roll Forward | The aggregate changes in the balance of gross unrecognized tax benefits are as follows: ​
​ | ​ | ​ | ​
​ | ​ | Federal
(in thousands) |  | and state
Balance as of September 30, 2018 | ​ | $ | 2,249
Increases related to tax positions taken during 2019 | ​ |  | 1,042
Balance as of September 30, 2019 | ​ | $ | 3,291
Increases related to tax positions taken during 2020 | ​ |  | 1,409
Balance as of September 30, 2020 | ​ | $ | 4,700
Increases related to tax positions taken during 2021 | ​ |  | 2,737
Balance as of September 30, 2021 | ​ | $ | 7,437

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