Intangible Assets (Tables)

9 Months Ended

Jan. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible assets

	Estimated useful life	As of January 31, 2016			As of April 30, 2015
Patent rights	15 years	$	2,223,686		$	2,223,686
Less: accumulated amortization			(110,632	)		(20,293	)
Intangible assets, net		$	2,113,054		$	2,203,393

Future annual amortization expense

April 30,
2016 (remainder of year)	$	29,367
2017		119,469
2018		119,469
2019		119,469
2020		119,469
Thereafter		1,605,811
	$	2,113,054