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Share-Based Payment Awards - Inducement Award Grants - Additional Information (Detail) - $ / shares
6 Months Ended 12 Months Ended
Nov. 26, 2018
Aug. 14, 2018
Aug. 01, 2018
May 14, 2018
Sep. 15, 2016
Dec. 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Chief Financial Officer [Member]                
Class of Stock [Line Items]                
Options granted     385,000          
Ratable annual vesting period of equity awards     3 years          
Exercise price of option     $ 2.22          
Chief Financial Officer [Member] | Performance Stock [Member]                
Class of Stock [Line Items]                
Cumulative measurement period     3 years          
Senior Vice President [Member]                
Class of Stock [Line Items]                
Options granted 350,000 100,000            
Ratable annual vesting period of equity awards 3 years 3 years            
Exercise price of option $ 2.07 $ 2.10            
President and CEO [Member]                
Class of Stock [Line Items]                
Options granted         850,000      
Ratable annual vesting period of equity awards         4 years      
Exercise price of option         $ 3.63      
Contractual life of option grants         10 years      
Inducement Award Grants [Member]                
Class of Stock [Line Items]                
Options granted           835,000    
Exercise price of option           $ 1.95    
Contractual life of option grants           10 years    
Weighted average grant date fair value of the inducement grants           $ 1.24 $ 1.14 $ 0.84
Number of options vested during period           402,500    
Inducement Award Grants [Member] | Chief Financial Officer [Member] | Performance Stock [Member]                
Class of Stock [Line Items]                
Number of performance stock units, granted     225,000          
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award           The PSUs are subject to proportional vesting based on cumulative measurement for the 3-year period ending June 30, 2021, with two-thirds of the award based upon defined amounts of the Company's product revenues and one-third based upon the net present value of each applicable business development transaction measured as of the date that each such transaction is consummated by the Company.    
Inducement Award Grants [Member] | Executive Vice President And General Manager [Member]                
Class of Stock [Line Items]                
Options granted       375,000        
Ratable annual vesting period of equity awards       3 years        
Cumulative measurement period       3 years        
Inducement Award Grants [Member] | Executive Vice President And General Manager [Member] | Performance Stock [Member]                
Class of Stock [Line Items]                
Number of performance stock units, granted       225,000        
Inducement Award Grants [Member] | Executive Vice President And General Manager [Member] | Cliff Vesting [Member]                
Class of Stock [Line Items]                
Options granted       65,000        
Ratable annual vesting period of equity awards       1 year        
Exercise price of option       $ 1.95        
Contractual life of option grants       10 years        
Market Based Restricted Stock Units [Member]                
Class of Stock [Line Items]                
Ratable annual vesting period of equity awards         3 years      
Number of performance stock units, granted         500,000      
Weighted average grant date fair value of the inducement grants         $ 1.45