Stockholders' Equity - Schedule of Stock Warrant Activity (Details)	9 Months Ended
	Jan. 31, 2018 $ / shares shares
Equity [Abstract]
Number of Warrants Outstanding, Beginning of Period	452,359
Number of Warrants, Recapitalization	33,415
Number of Warrants, Granted	1,250,000
Number of Warrants, Exercised
Number of Warrants, Forfeited
Number of Warrants, Cancelled
Number of Warrants Outstanding, End of Period	1,735,774
Warrants exercisable at end of period	485,774
Warrants expected to vest	1,250,000
Weighted Average Exercise Price of Warrants Outstanding, Beginning of Period | $ / shares	$ 2.64
Weighted Average Exercise Price, Recapitalization	32.61
Weighted Average Exercise Price, Granted | $ / shares	$ 3.30
Weighted Average Exercise Price, Exercised | $ / shares
Weighted Average Exercise Price, Forfeited | $ / shares
Weighted Average Exercise Price, Cancelled | $ / shares
Weighted Average Exercise Price of Warrants Outstanding, End of Period | $ / shares	3.69
Weighted Average Exercise Price, exercisable at end of period | $ / shares	4.70
Weighted Average Exercise Price, expected to vest | $ / shares	3.30
Weighted average fair value of warrants granted during the period | $ / shares	$ 1.24
Weighted Average Remaining Contractual Life in Years, Beginning of Period	4 years 2 months 23 days
Weighted Average Remaining Contractual Life in Years, Recapitalization	10 months 25 days
Weighted Average Remaining Contractual Life in Years, Granted	3 years 6 months
Weighted Average Remaining Contractual Life in Years, End of Period	3 years 5 months 1 day