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Stockholders' Equity - Pre-2017 Non-Qualified Stock Options, Additional Information (Details)
3 Months Ended
Sep. 30, 2017
option_grant
Sep. 11, 2017
$ / shares
shares
Oct. 31, 2017
USD ($)
shares
Oct. 31, 2016
USD ($)
$ / shares
shares
Sep. 05, 2017
shares
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) | $ / shares   $ 10.00      
Common Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock issued upon exercise of options (in shares)   7,997      
Pre-2017 Non-Qualified Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options outstanding (in shares)     3,188,000    
Options granted (in shares)     0    
Options, vested, forfeited (in shares)         572,000
Exercised options (in shares)   10,000      
Exercise price of options (in dollars per share) | $ / shares   $ 10.00      
Compensation cost not yet recognized | $     $ 1,300,000    
Pre-2017 Non-Qualified Stock Options | Prior Period Adjustment          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation | $     420,000 $ 181,000  
Pre-2017 Non-Qualified Stock Options | Two Employees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options granted (in shares)       50,000  
Options granted, exercise price (in dollars per share) | $ / shares       $ 10.00  
Expiration period       10 years  
Fair value of option granted | $       $ 425,000  
Pre-2017 Non-Qualified Stock Options | Two Employees | One through twenty month anniversaries          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options vested (in shares)       1,388  
Pre-2017 Non-Qualified Stock Options | Two Employees | Twenty-first through thirty-sixth month anniversaries          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options vested (in shares)       1,390  
Pre-2017 Non-Qualified Stock Options | Common Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock issued upon exercise of options (in shares)   7,997      
Pre-2017 Non-Qualified Stock Options, Remeasured          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of stock option grants remeasured | option_grant 2        
Share-based compensation | $     $ 92,300