6. STOCKHOLDERS EQUITY (Details)	Apr. 30, 2013
Total shares of common stock reserved for issuance	23,895,316
Stock Incentive Plans
Total shares of common stock reserved for issuance	20,081,954
Employee stock purchase plan
Total shares of common stock reserved for issuance	3,438,559
Warrants
Total shares of common stock reserved for issuance	374,803