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 |