Derivative Liability - Additional Information (Detail) - USD ($)	12 Months Ended
May 31, 2016	May 31, 2015
Derivative [Line Items]
Change in fair value of derivative liability	$ 646,505	$ (838,643)
AVCP Convertible Notes
Derivative [Line Items]
Change in fair value of derivative liability	$ 647,000	$ 839,000

Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959

Name:	us-gaap_GainLossOnDerivativeInstrumentsNetPretax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration