Accrued and Other Current Liabilities - Summary of Accrued and Other Current Liabilities (Details) - USD ($)	Oct. 31, 2018	Apr. 30, 2018
Payables and Accruals [Abstract]
Accrued sales commissions	$ 3,452,615	$ 2,091,081
Deferred sales revenues	2,116,474	1,096,180
Accrued expenses	275,703	252,259
Accrued interest payable	79,640	45,000
Notes payable	71,000	35,000
Accrued investments payable	69,907	34,644
Other accrued liabilities	596,019	65,444
Accrued and other current liabilities	$ 6,661,358	$ 3,619,608