Description of Business and Basis of Presentation - Supplemental Cash Flow (Details) $ in Thousands  | 
9 Months Ended | 
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 Jun. 30, 2020  
USD ($) 
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| Cash paid for amounts included in the measurement of lease liabilities: | |
| Operating cash flows from operating leases | $ 142 | 
| Right-of-use assets obtained in exchange for lease obligations: | |
| Operating leases | $ 511 | 
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- Definition Cash Flow, Lessee [Abstract] No definition available. 
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- Definition Right-Of-Use Asset Obtained In Exchange For Lease Liability [Abstract] No definition available. 
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- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. Reference 1: http://www.xbrl.org/2003/role/exampleRef 
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