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Stockholders' Equity - Common Stock (Details) - USD ($)
3 Months Ended
Sep. 23, 2017
Sep. 22, 2017
Sep. 11, 2017
Sep. 08, 2017
Oct. 31, 2017
Oct. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exercised options (in shares)     10,000      
Exercise price of options (in dollars per share)     $ 10.00      
Stock based compensation expense     $ 0      
Loss on settlement of accrued liability         $ 33,000 $ 0
Advisory Services            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock issued during period for services (in shares) 3,283          
Stock issued during period, value, issued for services $ 100,000 $ 133,000   $ 300,000    
Share price of stock issued (in dollars per share)   $ 40.58        
Stock issued during the period 133,000          
Loss on settlement of accrued liability $ 33,000          
Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock newly-issued during the period (in shares)         11,280  
Stock issued upon exercise of options (in shares)     7,997