兼职学生

Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Schedule of Stock Options Activity) (Details)

v3.19.1
Stockholders' Equity (Schedule of Stock Options Activity) (Details)
 9 Months Ended
Jan. 31, 2019
USD ($)
$ / shares
shares
Number of Shares 听
Exercised (49,792)
Stock Incentive Plan and Stock Option Grants to Employees and Directors [Member] 听
Number of Shares 听
Balance Outstanding, April 30, 2018 2,980,010
Granted 918,667
Exercised (195,629)
Forfeited (51,600)
Expired
Balance Outstanding, January 31, 2019 3,651,448
Exercisable, January 31, 2019 1,630,252
Weighted Average Exercise Price 听
Balance Outstanding, April 30, 2018 | $ / shares $ 3.62
Granted | $ / shares 7.12
Exercised | $ / shares 2.23
Forfeited | $ / shares
Expired | $ / shares
Balance Outstanding, January 31, 2019 | $ / shares 4.52
Exercisable, January 31, 2019 | $ / shares $ 2.65
Balance Outstanding, January 31, 2019 3 years 29 days
Exercisable, January 31, 2019 2 years 15 days
Aggregate Intrinsic Value 听
Balance Outstanding, April 30, 2018 | $ $ 16,558,373
Balance Outstanding, January 31, 2019 | $ 10,081,298
Exercisable, January 31, 2019 | $ $ 7,862,357