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5. Stockholders' Equity (Details - Common stock outstanding)
shares in Thousands
Apr. 30, 2021
shares
Common stock reserved for future issuance 14,142
Convertible Senior Notes [Member]  
Common stock reserved for future issuance 6,776
Stock Incentive Plans [Member]  
Common stock reserved for future issuance 6,290
Employee Stock Purchase Plan [Member]  
Common stock reserved for future issuance 1,076