7. EQUITY COMPENSATION PLANS (Details Narrative)	9 Months Ended
	Jan. 31, 2016 USD ($) shares
Employees [Member]
Unrecognized compensation cost | $	$ 3,802,000
Unrecognized cost amortization period	1 year 5 months 19 days
Non-Employees [Member]
Unrecognized compensation cost, nonemployees | $	$ 45,000
Unrecognized cost amortization period for nonemployees	7 months 13 days
2010 ESPP [Member]
Shares authorized under plan	5,000,000
Shares available to purchase	2,090,892
Shares purchased under ESPP	352,164
Stock Incentive Plans [Member]
Shares reserved for future issuance	39,587,885
Stock Options [Member]
Shares reserved for future issuance	23,654,555
Share-based awards [Member]
Shares reserved for future issuance	15,933,330