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v3.20.2

Summary of Operations and Significant Accounting Policies - Recently Issued Accounting Pronouncements - Additional Information (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Oct. 01, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract] |  |  |
Accounting standards update, adoption date | Oct. 01, 2019 |  |
Accounting standards update, adopted | true |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201602Member |  |
ROU assets | $ 5,150,000 |  | $ 195,000
Lease liabilities | $ 5,188,000 |  | $ 163,000
Additional ROU assets upon commencement of SiC/LED building lease |  | $ 5,000,000.0 |
Additional lease Liabilities upon commencement of SiC/LED building lease |  | $ 5,000,000.0 |

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