4. Stockholders' Equity (Tables)

12 Months Ended

Apr. 30, 2019

Equity [Abstract]

Schedule of common stock reserved for future issuance

	Shares
Stock Incentive Plans	7,264,713
Employee Stock Purchase Plan	1,196,261
Conversion of our outstanding Series E Preferred Stock(1)	6,826,435

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⁽¹⁾ The Series E Preferred Stock is convertible into a number of shares of our common stock determined by dividing the liquidation preference of $25.00 per share by the conversion price, currently $21.00 per share. If all of our outstanding Series E Preferred Stock were converted at the $21.00 per share conversion price, the holders of our Series E Preferred Stock would receive an aggregate of 1,961,619 shares of our common stock. However, we have reserved the maximum number of shares of our common stock that could be issued upon a change of control event assuming our shares of common stock are acquired for consideration of $5.985 per share or less. In this scenario, each outstanding share of our Series E Preferred Stock could be converted into 4.18 shares of our common stock.