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Common Stock Warrants (Details) - USD ($)
$ in Thousands
May 02, 2016
Sep. 30, 2018
Sep. 30, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Warrants issued in connection with subordinated debt (in shares) 53,619    
Warrant liability $ 177 $ 0 $ 306
Change in accounting principle - reclassification of warrant liability   306  
Retained Earnings      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Change in accounting principle - reclassification of warrant liability   129  
Additional Paid-In Capital      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Change in accounting principle - reclassification of warrant liability   177  
ASU 2017-11 | Warrants      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Change in accounting principle - reclassification of warrant liability   (306)  
ASU 2017-11 | Retained Earnings      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Change in accounting principle - reclassification of warrant liability   129  
ASU 2017-11 | Additional Paid-In Capital      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Change in accounting principle - reclassification of warrant liability   $ 177