Quarterly report pursuant to Section 13 or 15(d)

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

v3.10.0.1
Derivative Liability and Fair Value Measurements (Additional Information) (Detail) - shares
Sep. 30, 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 0 38,100