Income Taxes - Summary of Provision for Income Taxes Using Statutory Federal Tax Rate (Detail)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Expected U.S. federal statutory rate	(34.00%)	(34.00%)
State income taxes, net of federal benefit	(14.60%)	(5.80%)
Deferred tax true-up		18.70%
R&D credit		(1.40%)
Other permanent differences		0.30%
Provision for Income Tax, Gross	(48.60%)	(22.20%)
Change in valuation allowance	48.60%	22.20%
Totals	0.00%	0.00%

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Effective income tax rate reconciliation change in fair value of derivative liabilities.

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Effective income tax rate reconciliation deferred tax true up.

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Effective Income Tax Rate Reconciliation Research And Development Incentives

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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