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Stockholders' Equity - Warrants to Purchase Common Shares - Additional Information (Detail) - $ / shares
3 Months Ended
Jun. 26, 2018
Mar. 28, 2018
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2017
Jun. 30, 2017
Class of Stock [Line Items]            
Warrants, outstanding     486,812 486,812 0 623,605
Second Tranche Warrants [Member]            
Class of Stock [Line Items]            
Warrants, outstanding       20,184,224    
Senior Secured Term Loan [Member] | Warrants [Member]            
Class of Stock [Line Items]            
Warrants issued in connection with term loan facility 77,721 409,091        
Exercise price of issued warrants $ 1.93 $ 1.10        
Warrants exercise period 7 years 7 years        
Weighted average remaining life of warrants     6 years 6 months 14 days