Income Taxes - Components of deferred income tax assets and liabilities (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
In-process research and development	$ 996,154	$ 346,801
Net operating loss carry forward	878,706	407,398
R&D credit	15,779	2,584
Share-based compensation	256,219
Accrued expenses	17,850
Deferred tax assets gross	2,164,708us-gaap_DeferredTaxAssetsGross	756,783us-gaap_DeferredTaxAssetsGross
Less: valuation allowance	(2,164,708)	(756,783)
Deferred tax assets, net	$ 0us-gaap_DeferredTaxAssetsNet	$ 0us-gaap_DeferredTaxAssetsNet

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from in-process research and development costs expensed in connection with a business combination.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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