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Stockholders' Equity - Schedule of Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs) - $ / shares
3 Months Ended 6 Months Ended
Feb. 04, 2020
Oct. 31, 2020
Oct. 31, 2020
Number of Shares      
Unvested Balance Outstanding at April 30, 2020 (in shares)     643,175
Granted (in shares) 375,000   169,043
Exercised (in shares)     0
Forfeited (in shares)     (4,250)
Vested (in shares)   (131,250) (138,168)
Expired (in shares)     0
Unvested Balance Outstanding, October 31, 2020 (in shares)   669,800 669,800
Weighted Average Grant Price      
Unvested Balance Outstanding at April 30, 2020 (in dollars per share)     $ 5.64
Granted (in dollars per share)     9.33
Exercised (in dollars per share)     0
Forfeits (in dollars per share)     7.49
Vested (in dollars per share)     12.83
Expired (in dollars per share)     0
Unvested Balance Outstanding at October 31, 2020 (in dollars per share)   $ 6.16 $ 6.16