| 
           Employee Option Grants and Non-employee Option Grants (Detail) (USD $) 
         | 
        12 Months Ended | |
|---|---|---|
| 
           Jun. 30, 2013 
         | 
        
           Jun. 30, 2012 
         | 
      |
| Total stock-based compensation expense | $ 94,000 | $ 45,000 | 
| 
           Research and Development Expense [Member] 
         | 
        ||
| Total stock-based compensation expense | 10,000 | 8,000 | 
| 
           General and Administrative Expense [Member] 
         | 
        ||
| Total stock-based compensation expense | $ 84,000 | $ 37,000 | 
| X | ||||||||||
| 
             
- Definition 
          Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  |