Quarterly report pursuant to Section 13 or 15(d)

Derivative Liability and Fair Value Measurements (Additional Information) (Detail)

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Derivative Liability and Fair Value Measurements (Additional Information) (Detail) - shares
Mar. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right 38,100 38,100