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