Intangible assets - Additional Information (Detail) - USD ($)	1 Months Ended				12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Oct. 31, 2014	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Finite Lived Intangible Assets [Line Items]
Impairment Of Patents							$ 330,190
Legal Fees					$ 421,287	$ 219,270
Impairment Of Intangible Assets Finitelived	$ 1,000,000				5,780,951	8,121,966	0
Amortization of Intangible Assets						24,977	331,381
Acquired Research And Development			$ 9,800,000		8,100,000	9,800,000
Finite-Lived Patents, Gross			283,393
Goodwill			13,902,917		0	5,780,951
Goodwill, Impairment Loss			$ 8,121,966		5,780,951	8,121,966	0
Write-Off Of Prepaid Research Supplies					0	$ 669,750	0
Asset Impairment Charges	2,981,000	$ 2,800,000
Indefinite-Lived Intangible Assets (Excluding Goodwill)	$ 8,800,000
Acquired Research And Development [Member]
Finite Lived Intangible Assets [Line Items]
Impairment Of Intangible Assets Finitelived					$ 700,000
Patents [Member]
Finite Lived Intangible Assets [Line Items]
Impairment Of Intangible Assets Finitelived				$ 2,290,836			$ 1,350,591