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Income Taxes (Tables) | 12 Months Ended
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Sep. 30, 2021
Income Taxes |
Schedule of components of income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Fiscal Year Ended September 30,
​ |  | 2021 |  | 2020 |  | 2019
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Current provision (benefit): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ | $ | 95,818 | ​ | $ | (309,401) | ​ | $ | —
State | ​ |  | 9,911 | ​ |  | 481 | ​ |  | 1,749
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total current provision (benefit) | ​ |  | 105,729 | ​ |  | (308,920) | ​ |  | 1,749
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred provision (benefit) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ |  | (754,995) | ​ |  | — | ​ |  | —
State | ​ |  | (438,517) | ​ |  | 38 | ​ |  | 56
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total deferred provision (benefit) | ​ |  | (1,193,511) | ​ |  | 38 | ​ |  | 56
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total current and deferred provision (benefit) | ​ | $ | (1,087,783) | ​ | $ | (308,882) | ​ | $ | 1,805
Schedule of reconciliation of the statutory federal rate to the Company's effective income tax rate | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Fiscal Year Ended September 30, |
​ |  | 2021 |  | 2020 |  | 2019 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Federal statutory tax rate |  | 21.00 | % | 21.00 | % | 21.0 | %
Rate change due to tax reform | ​ | 0.0 | % | 0.0 | % | 0.0 | %
State income taxes, net of federal benefit |  | 0.6 | % | (2.2) | % | (0.9) | %
Permanent items |  | 0.2 | % | (6.3) | % | 0.8 | %
Research and development tax credits |  | (0.6) | % | (10.6) | % | (0.8) | %
Valuation allowance |  | (47.9) | % | (15.2) | % | (20.2) | %
Change in unrecognized tax benefits |  | (0.7) | % | 2.2 | % | 0.2 | %
Tax Law Changes: CARES Act | ​ | 0.0 | % | 0.3 | % | 0.0 | %
Other | ​ | 0.0 | % | 0.3 | % | 0.0 | %
Effective income tax rate |  | (27.4) | % | (10.4) | % | 0.1 | %
Schedule of deferred tax assets and liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of September 30, | ​ | ​ | ​
​ | ​ | 2021 | ​ | 2020 | ​ | 2019
​ |  | Non Current |  | Non Current |  | Non Current
Deferred tax assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Reserves and accruals | ​ | $ | 654,624 | ​ | $ | 698,233 | ​ | $ | 690,148
Research and development credit | ​ | ​ | 1,327,162 | ​ | ​ | 1,589,247 | ​ | ​ | 1,331,170
NOL carryforwards -fed/state | ​ | ​ | 1,612,043 | ​ | ​ | 2,192,018 | ​ | ​ | 2,590,791
Depreciation | ​ | ​ | ​ | ​ | ​ | (807,522) | ​ | ​ | (826,724)
Stock options | ​ | ​ | 41,652 | ​ | ​ | 5,296 | ​ | ​ | 348,624
​ | ​ | ​ | 3,635,481 | ​ | ​ | 3,677,272 | ​ | ​ | 4,134,009
Less: Valuation allowance | ​ | ​ | (1,449,204) | ​ | ​ | (3,471,164) | ​ | ​ | (3,922,620)
Total deferred tax assets | ​ | ​ | 2,186,277 | ​ | ​ | 206,108 | ​ | ​ | 211,389
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred tax liabilities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Depreciation | ​ | ​ | (1,122,455) | ​ | ​ | (335,797) | ​ | ​ | (341,040)
Total deferred tax liabilities | ​ | ​ | (1,122,455) | ​ | ​ | (335,797) | ​ | ​ | (341,040)
Net deferred tax asset (liability) | ​ | $ | 1,063,822 | ​ | $ | (129,689) | ​ | $ | (129,651)
Schedule of reconciliation of beginning and ending balances of total amounts of gross unrecognized tax benefits | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Fiscal Year Ended September 30,
​ |  | 2021 |  | 2020 |  | 2019
Balance at beginning of year | ​ | $ | 615,000 | ​ | $ | 546,000 | ​ | $ | 540,000
Unrecognized tax benefits related to prior years | ​ |  | — | ​ |  | 39,000 | ​ |  | —
Unrecognized tax benefits related to current year | ​ |  | 7,000 | ​ |  | 37,000 | ​ |  | 6,000
Decrease in unrecognized tax benefits due to the lapse of applicable statute of limitations | ​ |  | (32,000) | ​ |  | (7,000) | ​ |  | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at end of year | ​ | $ | 590,000 | ​ | $ | 615,000 | ​ | $ | 546,000

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