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Long-term debt (Tables) | 12 Months Ended
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Sep. 30, 2021
Long-term debt |
Schedule of Future Maturities of Long Term Debt | Future maturities of the Fourth Loan as of September 30, 2021 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | Principal |  | Interest |  | Total
Years ending September 30, 2022 | ​ | $ | 833 | ​ | $ | 9 | ​ | $ | 842
​ | ​ | $ | 833 | ​ | $ | 9 | ​ | $ | 842
Less: Interest | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | (9)
Total amount of loan principal | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | 833
Less unamortized debt discount | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | (4)
Add: accretion of final payment fee | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | 723
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 1,552

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- Definition Tabular disclosure of maturity and sinking fund requirement for long-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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