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9. EQUITY COMPENSATION PLANS (Tables)
 9 Months Ended
Jan. 31, 2013
Equity Compensation Plans Tables  
Stock Options
Stock Options   Shares     Weighted Average 
Exercisable
Price		  
Outstanding, May 1, 2012     7,531,651     $ 2.90  
Granted     8,556,862     $ 0.87  
Exercised     (92,497 )   $ 0.86  
Canceled or expired     (508,315 )   $ 1.70  
Outstanding, January 31, 2013     15,487,701     $ 1.83
Share-based compensation expense
    Three Months Ended  
January 31,		     Nine Months Ended
January 31,		  
    2013     2012     2013     2012  
Cost of contract manufacturing   $ 37,000     $ 5,000     $ 55,000     $ 10,000  
Research and development     539,000       299,000       1,151,000       920,000  
Selling, general and administrative     453,000       455,000       1,114,000       1,508,000  
    Total   $ 1,029,000     $ 759,000     $ 2,320,000     $ 2,438,000  
                                 
Share-based compensation from:                                
Stock options   $ 870,000     $ 720,000     $ 2,069,000     $ 2,356,000  
Employee stock purchase plan     159,000       39,000       251,000       82,000  
    $ 1,029,000     $ 759,000     $ 2,320,000     $ 2,438,000