Derivative Liabilities - Summary of (Loss) Gain on Derivative Liability (Details) - USD ($)	3 Months Ended		6 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Day-one loss due to derivative liabilities on convertible notes payable and warrants			$ (678,941)	$ (2,099,349)
Change in derivative liabilities			20,015,840
Gain from marked-to-market adjustments			10,547,737	976,758
Net gain (loss) on change in fair value of derivative liabilities	$ 29,910,472	$ (1,100,587)	$ 29,884,636	$ (1,122,591)	[1]

[1] Represents results of operations for the period from May 5, 2017 (inception) to October 31, 2017.