Commitments - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	May 31, 2015	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jul. 31, 2010
Operating Leased Assets [Line Items]
Rent expense		$ 94,501	$ 189,003	$ 94,501	$ 189,003
Amount payable upon the achievement of specified regulatory milestone						$ 18,000,000
Operating lease term July 2014 through December 2019 [Member]
Operating Leased Assets [Line Items]
Lease renewal term				5 years
Future minimum payments for noncancelable operating lease		$ 1,400,000		$ 1,400,000
Operating lease term September 2015 through September 2020 [Member]
Operating Leased Assets [Line Items]
Percentage of base rent escalator	3.00%
Rent expense	$ 32,784
Lease agreement rent expense for future period	$ 39,268