| Right-of-Use Asset and Operating Lease Liability - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Sep. 30, 2021 | 
|---|---|---|
| Operating leases: | ||
| Operating right-of-use asset | $ 713 | $ 654 | 
| Operating lease liability, current | 438 | 431 | 
| Operating lease liability, long-term | $ 278 | $ 222 | 
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- References No definition available. 
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Amount of lessee's right to use underlying asset under operating lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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